Condition

Scalp Psoriasis

Scalp psoriasis is psoriasis on the head. It causes thick, sharply edged patches with silvery scale that often itch and flake. It is the most common place for psoriasis to start, and it treats well - but the treatment has to reach the skin through the hair, which is where most people go wrong.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
16:9 hero for Scalp Psoriasis. Never cropped: the tone strip and the corner logo depend on the full frame.

Start here

The scalp is the hardest place on the body to treat, and almost never because the disease is worse there — getting medicine onto skin covered in hair is simply awkward. Most people I see have been using the right product in exactly the wrong way, rubbing it through the hair instead of parting the hair and putting it on the skin. This is not dandruff and it has nothing to do with washing: psoriasis is an immune condition, and the flaking is skin made faster than it can shed. Soften the scale first, then treat the skin underneath — medicine cannot get through a thick plate of scale.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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How commonAbout half of people with psoriasis have it on the scalp, and for many it is the first place it shows up
Who gets itAnyone with psoriasis. It runs in families and most often starts between the late teens and the thirties
Curable or managedManaged - it settles with treatment and tends to return when treatment stops
Prescription neededOften. Medicated shampoos help mild cases, but thick or stubborn patches usually need a prescription foam, solution or oil
Time to improveAbout 4 to 8 weeks

What It Is

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Scalp psoriasis is the same disease as psoriasis anywhere else, in a place where hair changes how it looks and how it is treated. The immune system is overactive, so skin is made faster than it can shed. The cells pile up as scale, and the skin underneath becomes inflamed.

The patches are thick, raised and sharply bordered - run a finger along the edge and you can feel where the patch stops. The scale is dry, silvery-white and sticky. Common spots are the hairline, behind the ears, the back of the neck and the crown, and it often extends past the hairline onto the forehead, one of the best clues that this is psoriasis and not dandruff.

Most people report itch, tightness or soreness rather than pain, and some notice nothing but flakes on a collar. Hair can thin over a bad patch, mostly from scale lifting hairs out and from scratching, and it grows back once the inflammation settles.

It is not contagious, and it has nothing to do with how clean anyone is.

Symptoms

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Scale at the edges

Along the Hairline

Thick scaly patches at the hairline, behind the ears and at the nape, often the first place it shows. The edge is sharply defined rather than blurred. It is easy to mistake for stubborn dandruff.
Built-up crusted scale

Thick Plaques

Heaped silvery scale that can sit millimetres thick and lift the hair, sometimes covering large areas of the scalp. Picking it off can pull hair with it. Softening the scale first is what lets treatment reach the skin.
Thinning over patches

With Hair Loss

Temporary thinning over affected areas, usually from scale build-up and scratching rather than from the psoriasis destroying follicles. Hair generally regrows once the plaques settle. Persistent bald patches should be reassessed.

How It Looks by Skin Tone

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Parted hair on fair scalp skin showing a raised salmon-pink plaque topped with dry silvery-white scale, with a sharply drawn border against normal skin.Parted hair on medium olive scalp skin showing a raised plaque with a dusky pink-brown base under dry silvery scale, with a clearly defined edge.Parted hair on brown scalp skin showing a raised plaque with a violet-brown base under dry silvery scale, with a clearly drawn border and no visible redness.Parted hair on deep brown scalp skin showing a raised gray-violet plaque topped with grayish scale, and beside it a flat lighter patch of healed skin with no scale.
LightMediumBrownDeep

On deeper skin tones a psoriasis patch is often violet, gray or dark brown rather than pink or red. The redness doctors are trained to look for is frequently not the obvious feature, so the sharp border and the silvery scale become the reliable clues. This causes real delay - scalp psoriasis on deeper skin tones is regularly treated as dandruff or seborrheic dermatitis for years.

A cleared patch usually leaves a flat mark, either darker than the surrounding skin, called post-inflammatory hyperpigmentation, or lighter, called post-inflammatory hypopigmentation. Either can take several months to even out, and neither is active disease. That matters, because the mark gets mistaken for psoriasis that has not cleared and answered with more steroid than the skin needs. Hair care changes what is practical. If hair is washed weekly rather than daily, a plan built around a daily medicated shampoo is not going to happen. Foams, solutions and oils that stay on between washes fit better, with a shampoo on wash day. Tight braids, weaves and extensions pull on skin that is already inflamed, and injury can bring on new patches, so loosen styles during a flare.

Where It Shows Up

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Front view of a head with red marks across the whole scalp, past the hairline onto the forehead and behind both ears.
Scalp, hairline and behind the ears
Plaques can cover the whole scalp or sit as a few thick patches. The giveaway is that they do not stop at the hair — they run past the hairline onto the forehead, behind the ears and into the ear canal. Dandruff stays on the scalp; this does not.
Back view of a whole body with red marks on the back of the head, behind both ears and at the nape of the neck. The rest of the body is clear.
The back of the head and the nape
The back of the head and the nape of the neck are commonly involved and are the parts you cannot see, so they often go untreated. Thick scale at the nape is also the part that shows above a collar.

What Happens in the Skin

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This is what is going wrong under the skin, in the order it happens. Click a step to see it.

How Scalp Psoriasis happens
Skin basics
BARRIEREPIDERMISDERMIS28 days4-6 daysDEAD SKIN0NORMAL SCALP1AN OVERACTIVE IMMUNE SIGNAL2SKIN CELLS MULTIPLYING TOO FAST3SCALE PILING UP ON THE SCALP4ITCH, SCRATCHING AND INJURY

On a healthy scalp the skin replaces itself over about a month. New cells move up slowly and the old ones shed as flakes too small to see. The immune cells sitting in the skin stay quiet unless there is something real to fight.

Immune cells in the scalp switch on when there is nothing to fight and release signals, mainly interleukin 17 and interleukin 23, that tell the skin underneath to speed up.

Skin that normally replaces itself over about a month does it in a few days, so cells reach the surface before they are ready and before the old ones have shed.

Those unshed cells stack into a thick silvery plate around the hairs. This is the step that defeats treatment, because medicine cannot pass through the scale to reach the skin below it.

The plaque itches and feels tight, scratching and combing injure the skin, and psoriasis appears wherever skin has been damaged — so the patch spreads rather than settles. Almost everything on the lists below is pushing on this loop.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Psoriasis starts with an immune system switched on when it should not be. Immune cells in the skin release signals - interleukin 17 and interleukin 23 are the two most discussed - telling the skin cells underneath to multiply. Normal skin replaces itself over roughly a month. In a psoriasis patch it takes a few days.

Those cells reach the surface before they are ready and before the old ones have shed, piling up as thick scale. The blood vessels widen and more immune cells move in, which makes the skin underneath look red or violet and feel warm and sore.

Genes set the stage, then something sets it off - a strep throat, an injury, stress, smoking, or certain medicines. The scalp is a common first site partly because it is easy to injure. Combing, scratching and picking all count, and psoriasis appears exactly where skin has been damaged. That reaction, the Koebner phenomenon, is why scratching a patch makes it wider rather than just angrier.

Risk Factors

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Some people are simply more likely to develop psoriasis. Genes, age, infections and a few medicines raise the odds, and most of it cannot be changed.

Inherited
Family history
The strongest single factor. A parent or sibling with psoriasis raises your risk substantially.
Age
Age
Most often begins between the late teens and thirties, with a smaller second peak in the fifties and sixties.
Other health conditions
Strep throat and other infections
A throat infection can set psoriasis off for the first time, especially in children and young adults, and can flare it.
Other health conditions
Some medicines
Lithium, beta blockers, antimalarials, and stopping oral steroids quickly can all trigger a flare. Never stop one on your own - ask your doctor.
Habits & products
Injury to the scalp
Cuts, sunburn, scratching, harsh combing and chemical burns can bring on a patch.
Habits & products
Smoking
Linked to getting psoriasis and to controlling it less well.
Habits & products
Excess weight
Associated with more severe psoriasis and a poorer response to treatment.
Habits & products
Heavy alcohol use
More severe psoriasis, treatments working less well.
Habits & products
Stress
A very common flare trigger, though not the cause of the disease.

Course

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Scalp psoriasis runs in flares and quiet stretches. It responds well to treatment and returns when treatment stops, so the arc below is about treating it and keeping it quiet.

Weeks 4 to 8Clear or nearly clear
Most scalp psoriasis responds in this window

With treatment, most scalp psoriasis clears or nearly clears in about four to eight weeks.

As the scale clearsHair growing back
Hair loss over a patch is almost always temporary

Hair regrows once the inflammation and scale are gone. Scarring, permanent hair loss is rare.

A few months after stoppingBack where you started
It usually returns if treatment stops outright

Which is why treatment is stepped down to maintenance - a medicated shampoo twice a week - not stopped.

Year to yearFlares and quiet stretches
The pattern is up and down

Most people have weeks or months where it is barely there, then a stretch where it thickens and itches. Cold, dry months are worst; many people settle in summer.

Over the yearsTwo things to watch
Psoriasis can show up beyond the scalp

Psoriasis on the scalp raises the chance of it appearing elsewhere. Scalp and nail involvement are both linked to a higher chance of psoriatic arthritis, a joint condition that can start years after the skin. Report joint pain, morning stiffness lasting more than half an hour, or a swollen finger or toe early - treating it early protects the joints.

ElbowsKneesNails

What Makes It Better & Worse

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Scalp psoriasis is kept going by four things — an overactive immune signal, cells multiplying too fast, scale piling up, and itch and injury. Most scalp treatment failures are step 3 failures — the medicine was fine, it never reached the skin.

What is driving yours?

FAT28 days4-6 daysDEAD SKINBARRIEREPIDERMISDERMIS

Immune cells in the scalp switch on when there is nothing to fight and release signals, mainly interleukin 17 and interleukin 23, that tell the skin underneath to speed up.

Skin that normally replaces itself over about a month does it in a few days, so cells reach the surface before they are ready and before the old ones have shed.

Those unshed cells stack into a thick silvery plate around the hairs. This is the step that defeats treatment, because medicine cannot pass through the scale to reach the skin below it.

The plaque itches and feels tight, scratching and combing injure the skin, and psoriasis appears wherever skin has been damaged — so the patch spreads rather than settles. Almost everything on the lists below is pushing on this loop.

What helps

  • Coal tar shampoo Slows cell turnover, reduces scale.
  • Part the hair and apply to the scalp In rows, on skin, not hair.
  • Prescription steroid foam or solution First choice for an active flare, short courses.
  • A combined steroid and vitamin D foam Both mechanisms, one daily application.
  • Phototherapy with a UVB comb A clinic unit that parts the hair.
  • Pills or biologic injections For severe or widespread disease.
  • Steroid injections into a thick patch In clinic, for stubborn patches.
  • Stay on a maintenance plan Medicated shampoo once or twice a week.

What makes it worse

  • Stopping treatment when it looks clear Controlled, not cured.
  • Strep throat and other infections A recognized flare trigger.
  • Stress A consistently reported flare trigger.
  • Smoking More severe disease, weaker treatment response.
  • Heavy alcohol use More severe psoriasis, poorer response.
  • Some medicines Lithium, beta blockers, antimalarials — never stop one yourself.

What helps

  • Calcipotriene, a vitamin D treatment Slower than a steroid, usable for longer.

What helps

  • Soften the scale before you treat Oil or salicylic acid loosens it.
  • Salicylic acid shampoo Dissolves the bonds holding scale.
  • Leave the shampoo on Five to ten minutes before rinsing.
  • Ketoconazole shampoo Treats seborrheic flaking psoriasis treatment will not touch.

What makes it worse

  • Only shampooing the hair, not the scalp Medicated shampoo works on skin.
  • Rinsing medicated shampoo off at once Coal tar and salicylic acid need five to ten minutes.
  • Picking and lifting the scale off Tears skin, takes hair with it.
  • Cold, dry weather and indoor heating Dry air thickens scale.

What helps

  • Moisturize the scalp Reduces tightness and the itch that drives scratching.
  • Cool it instead of scratching A cold, damp cloth.

What makes it worse

  • Scratching Psoriasis appears where skin has been injured.
  • Fine-tooth combs and hard brushing Picking, spread wider.
  • Chemical processing during a flare Relaxers and dyes burn inflamed skin; burns bring patches.
  • Tight braids, weaves and extensions Constant pull on an inflamed scalp.

How These Treatments Work

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Treatments for Scalp Psoriasis do not all work in the same place. Tap one to see where it acts.

Pick a treatment
Skin basics
BARRIEREPIDERMISDERMIS28 days4-6 daysDEAD SKINLIFTS THE SCALESOFTENS THICK SCALECALMS THE INFLAMMATIONSLOWS SKIN CELLS DOWNQUIETS THE IMMUNE SIGNAL

It has to sit on the scalp rather than the hair, and it needs a few minutes to work.

Thick plaques block every other treatment until they are loosened.

A liquid or foam reaches the scalp where a cream sits in the hair.

Often paired with a steroid in the same bottle.

For a scalp that will not clear, or psoriasis elsewhere as well.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Over-the-Counter Products

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Everything here you can buy without seeing anyone.

Five medicated scalp products on white, including Amazon Basics tar gel, T+Plus, MG217, RoyceDerm and Nizoral16:9 hero for Coal Tar. Never cropped: the tone strip and the corner logo depend on the full frame.
Strong evidence
The most useful thing on the shelf for scalp psoriasis. It slows the overactive cell turnover and takes down scale and itch, which no other over-the-counter option does. Apply it to the parted scalp rather than the hair, leave it five to ten minutes, and expect a smell and possible staining of light hair and towels.
Paula's Choice 2% BHA exfoliant, La Roche-Posay Effaclar cleanser and a CeraVe psoriasis cream pumpLabeled cutaway diagram of a single skin pore, headed Salicylic Acid. The epidermis is a brick-textured band across the top and the dermis is pink below it, with a yellow oil gland at the base of the pore and a small cluster of bacteria inside it. A single dark navy callout line points into the top of the pore: decreases dead cells in pore. There are no other callouts, so the drawing shows one effect where the other ingredient diagrams show two or three.
Moderate evidence
A descaler, not a treatment. It dissolves the bonds holding the plate of scale together so that medicine can reach the skin underneath, which is the step most people skip. Use it before the active treatment, not instead of it, and go easy on large areas because it can make hair brittle.
16:9 hero for Ketoconazole. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Ketoconazole works in the skin
Moderate evidence
An antifungal shampoo that does nothing to psoriasis itself but clears the seborrheic flaking sitting on top of it, which many people with scalp psoriasis also have. It is worth adding when the flakes are greasy and yellow as well as dry and silvery. If your scale is purely psoriasis, it will not help.
Five coconut oil bottles and a jar on white, most labeled fractionated or organic virgin coconut oil16:9 hero for Coconut Oil. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
Warm oil left on the scalp for an hour, or overnight under a cap, softens thick scale so it lifts in the wash instead of tearing. That is a real and useful job. It does nothing about the immune inflammation underneath, so on its own it manages the flakes and leaves the disease running.
Four dandruff shampoo bottles: DHS Zinc, Head and Shoulders Classic Clean, CeraVe Anti-Dandruff and Head and Shoulders Bare16:9 hero for Pyrithione Zinc. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
The active ingredient in most ordinary anti-dandruff shampoos. It is gentler than coal tar and can settle light flaking, but it was designed for the yeast behind dandruff rather than for psoriasis. If patches are thick or sharply bordered, this is not the one to keep trying.

Prescriptions

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These need a prescription.

16:9 hero for Clobetasol Propionate. Never cropped: the tone strip and the corner logo depend on the full frame.
Clobetasol Propionate
Strong evidence
The workhorse for an active scalp flare, as a foam, solution or shampoo made to spread through hair onto skin. It usually calms itch within days and clears patches over two to four weeks. It is used in short courses, because strong steroids used continuously thin the skin — so it breaks the flare and something gentler holds it.
16:9 hero for Calcipotriene. Never cropped: the tone strip and the corner logo depend on the full frame.
Calcipotriene with a steroid
Strong evidence
A combined foam containing a vitamin D treatment and a steroid, applied once a day. It is the most effective single scalp product most people will be given, because it works on the immune signal and the fast cell turnover at once. It is expensive and often needs the pharmacy chased, which is worth knowing before you start.
16:9 hero for Calcipotriene. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Calcipotriene works in the skin
Moderate evidence
A vitamin D treatment that slows the skin cells down. It is slower than a steroid, taking six to eight weeks, but it can be used for far longer without thinning the skin, so it is often what keeps a scalp clear after a steroid has broken the flare. It can sting on cracked skin.
16:9 hero for Roflumilast Cream (Zoryve). Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Roflumilast Cream (Zoryve) works in the skin
Moderate evidence
A newer non-steroid foam approved for scalp and body plaque psoriasis, used once a day. It suits people who do not want to keep returning to strong steroids, or who have been on them a long time. It is costly, and coverage is often the deciding factor rather than the medicine.
16:9 hero for Mometasone. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Mometasone works in the skin
Moderate evidence
A mid-strength steroid lotion, used where clobetasol is more than the situation needs or for the thinner skin behind the ears and along the hairline. It is also a common step-down after a flare has settled. Like all steroids it is for courses, not for indefinite daily use.
An amber pill bottle labeled Otezla tipped over with white tablets spilling out16:9 hero for Apremilast (Otezla). Never cropped: the tone strip and the corner logo depend on the full frame.
Strong evidence
A tablet with trial evidence specifically in scalp psoriasis, which is unusual — most tablets are tested on the body and assumed to help the scalp. It needs no blood monitoring, which suits people who would rather not have regular tests. Nausea, loose stools and headache are common in the first fortnight and usually settle.
16:9 hero for Methotrexate. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Methotrexate works in the skin
Moderate evidence
A long-established weekly tablet for psoriasis that is widespread, or scalp disease that has not budged on foams and solutions. It also treats psoriatic arthritis, which makes it a sensible choice when the joints are involved too. It needs regular blood tests, and it must not be taken in pregnancy.
An orange prescription bottle labeled Sotyktu on its side with white round tablets spilling out16:9 hero for Deucravacitinib (Sotyktu). Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
A daily tablet that blocks one of the immune signals driving psoriasis, with scalp improvement recorded in its trials. It is generally better tolerated than methotrexate and needs less monitoring. It is newer and expensive, so it usually comes after other options have been tried.
An amber pill bottle labeled Cyclosporine tipped over with white tablets spilling out16:9 hero for Cyclosporine. Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
Works faster than anything else in tablet form and is used to rescue a severe flare. It is a short-term measure only — usually a few months — because it raises blood pressure and can affect the kidneys over time. Something steadier is normally started underneath it.
An amber prescription bottle lying on its side on a white background with a plain white label reading Acitretin, and six small round white tablets spilled out in front of it.
Acitretin
Limited evidence
A vitamin A tablet used mainly for thick, scaly psoriasis, sometimes alongside light treatment. It works slowly and causes dry lips, dry eyes and hair thinning, which makes it an awkward fit when the complaint is the scalp. It must never be taken in pregnancy, and it stays in the body for a long time afterwards.
16:9 hero for Prednisone. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Prednisone works in the skin
Weak evidence
Steroid tablets clear psoriasis quickly and then it commonly comes back worse as the course finishes, occasionally in a severe form. For that reason they are avoided in psoriasis. If you are already on a course for something else, do not stop it yourself — ask the doctor who prescribed it.
A gray autoinjector pen labeled Skyrizi with a teal button, lying on a plain pale background16:9 hero for Risankizumab (Skyrizi). Never cropped: the tone strip and the corner logo depend on the full frame.
Strong evidence
A biologic injection that blocks interleukin 23, one of the two signals named at the top of this page. Given every twelve weeks after the starting doses, it clears most people's psoriasis including the scalp. It is for severe or stubborn disease, needs screening for tuberculosis first, and slightly raises the risk of infections.
A silver and dark pink autoinjector pen labeled Humira lying on a white background16:9 hero for Adalimumab (Humira). Never cropped: the tone strip and the corner logo depend on the full frame.
Strong evidence
An older biologic, injected at home every other week, and often the first one insurance will cover. It treats psoriatic arthritis as well as the skin, which makes it a good fit when joints are involved. It needs tuberculosis screening and periodic blood tests, and some people gradually stop responding to it.

Procedures

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These are done in the office, usually over several visits.

16:9 hero for Phototherapy. Never cropped: the tone strip and the corner logo depend on the full frame.16:9 hero for Narrowband UVB Phototherapy. Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
Narrowband UVB delivered by a hand-held comb that parts the hair to reach the scalp skin. It suits people who would rather not take tablets, and it fits with the way many people find their psoriasis improves in summer. It means clinic visits two or three times a week for a couple of months, which is the main reason people stop.
16:9 hero for Excimer Laser. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Excimer Laser works in the skin
Moderate evidence
A focused ultraviolet beam aimed at individual patches, useful when only a few areas of scalp or hairline are involved. It treats the patch without exposing the rest of the skin. Hair blocks the beam, so it works best on the hairline and on thinner, shorter hair.
A gloved clinician injecting a raised lump on a patient's shoulder with a small syringeA small clear glass vial with a metal crimped cap lying on a white background, with a clear plastic syringe and a fine sheathed needle resting against it.
Limited evidence
Steroid injected directly into one or two thick patches that have refused everything applied on top. It flattens them within a few weeks. It is done in clinic, it stings, and it is not a plan for a whole scalp — repeated injections in the same spot can leave a dent in the skin.

When to See a Dermatologist

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Do not spend long on shampoo here - prescription scalp treatments are far more effective than anything on the shelf, and six months proving otherwise is wasted. Book if over-the-counter shampoo has changed nothing after four to six weeks, if the patches are thick or spreading, if the itch is keeping you awake, if you are shedding hair over the patches, or if the scalp is cracked, sore, weeping or crusted, which can mean infection. Book too if you are getting patches elsewhere, if your nails are pitting, lifting or crumbling, or if you have joint pain, swelling or morning stiffness lasting more than half an hour, because early treatment protects the joints. This is diagnosed by looking, not testing, so bring photographs of a flare - scalps have a habit of behaving on the day.

— Dr. Schwarz, Board Certified Dermatologist

Complications

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Psoriatic arthritis

A joint condition that develops in some people with psoriasis, often years after the skin. Scalp and nail involvement are both linked to a higher chance of it. The signs are joint pain, swelling, morning stiffness lasting more than half an hour, or a whole finger or toe swelling up. Report them early rather than waiting, because treating it early is what protects the joints.

Nail Psoriasis

Psoriasis often turns up in the nails of people who have it on the scalp. The nail develops small pits like pinpricks, yellow-brown patches like a drop of oil under the plate, crumbling, or lifting away from the nail bed. It is worth pointing out at an appointment, because nail changes are also linked to a higher chance of joint disease.

Infection in a cracked scalp

A plaque that has been picked, scratched or split can let bacteria in. The signs are weeping, honey-colored crust, a sore hot area, or swollen glands in the neck. It is uncommon and it treats easily with antibiotics, but it needs to be looked at rather than covered with more steroid. Softening the scale instead of lifting it off is what prevents it.

Lookalikes

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Dandruff

Both flake, and both itch, so scalp psoriasis is very often treated as stubborn dandruff for years. Dandruff makes loose, soft, yellowish flakes spread thinly over the whole scalp with no patch you can feel the edge of. Psoriasis builds a raised plaque with a border you can trace with a finger, and it does not usually clear on an ordinary anti-dandruff shampoo.

Seborrheic Dermatitis

The fuller version of dandruff, and the hardest one to separate from psoriasis. Its scale is greasy and yellowish, the edges of the patches fade into normal skin, and it usually also sits in the eyebrows, the creases beside the nose and the ears. Psoriasis scale is dry and silvery and stops at a sharp line. The two can also run on the same scalp at once, which is why some treatment plans cover both.

Ringworm

A fungal infection of the scalp, far more common in children, and the one it matters most not to miss. It also makes a scaly round patch, but the hairs inside it snap off close to the skin, leaving black dots and a bald area, and the glands at the back of the neck are often swollen. It needs antifungal tablets, not shampoo or a steroid, and a steroid alone can make it worse.

Myths

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  • "Scalp psoriasis is just bad dandruff." Different conditions. Dandruff, or seborrheic dermatitis, makes greasy yellowish flakes with soft, blurred edges. Psoriasis makes thick, dry, silvery scale on a patch with a sharp border, often extending past the hairline. They can occur on the same scalp, which is part of why the confusion lasts.
  • "It means my scalp is dirty." Nothing to do with hygiene. Psoriasis is an immune condition, and the flaking is skin produced faster than it can shed. Washing more does not clear it; washing less does not cause it.
  • "Washing my hair makes it worse." Regular washing helps - it removes loosened scale so treatment can reach the skin. Hot water, harsh shampoos and hard scrubbing make it worse, not washing itself.
  • "It's contagious." It is not You cannot catch psoriasis, share it through a hairbrush, or pass it to a partner or a child.
  • "The hair I'm losing is gone for good." Almost never. Hair thins over an active patch because scale lifts hairs out and scratching breaks them, and it regrows once the patch settles. Scarring hair loss is rare.
  • "Cutting my hair short will fix it." Shorter hair can make treatment easier to apply, and some people prefer that. It does not treat the disease, and cutting hair you would rather keep is not necessary.
  • "Natural oils alone will clear it." Oils genuinely help soften scale before washing. They do not reduce the inflammation underneath, so on their own they manage the flakes and leave the disease running.

Questions Patients Ask

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Will my hair grow back?

In almost all cases, yes. Hair thins over an active patch because thick scale lifts hairs out as it sheds and scratching breaks them. Once the inflammation and scale are treated, the follicles are intact and hair regrows over the following months. Scarring hair loss is rare, and more likely in a long-picked patch.

How do I tell scalp psoriasis from dandruff?

Look at the edges and the color. Psoriasis makes a patch you can feel the border of, with dry silvery-white scale, and it commonly runs past the hairline onto the forehead or behind the ears. Dandruff makes softer, greasier, yellower flakes that fade into normal skin. If both are present, which is common, treatment needs to cover both.

Can I dye or relax my hair?

When the scalp is calm, usually yes. When it is flaring, cracked or sore, chemical processing can burn inflamed skin, and burned skin is exactly where new psoriasis appears. Wait until it settles, tell your stylist what is going on, and ask for a patch test.

Do I have to use the shampoo forever?

Not at flare-level intensity, but most people do better on maintenance. A shampoo once or twice a week keeps a scalp clear far more comfortably than clearing a thick flare every few months. It is ongoing management, not a course you finish.

Why does it come back as soon as I stop?

Treatment controls the immune signal driving the disease, it does not switch it off. Stop the treatment and the signal is still there. That is expected, not failure, and it is why dermatologists step treatment down rather than stopping it.

Does having it on my scalp mean I will get it elsewhere?

It raises the chance without guaranteeing it - plenty of people have scalp psoriasis and nothing else for decades. Scalp and nail involvement are both linked to a higher chance of psoriatic arthritis, so joint pain, swelling or morning stiffness lasting more than half an hour should be mentioned to a doctor.

References

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