Infantile seborrhoeic dermatitis commonly producing greasy adherent scalp scale. 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.
The same eight facts on every condition comparison.
Cradle Cap Adherent yellowish flakes form a patch across the top of the scalp.
Thick scale Silvery patches on the scalp.
Past the hairline Spreads onto the forehead.
Behind the ears Scale and redness.
Early-life oil production and the skin's response to Malassezia yeast contribute to scalp inflammation and scale. The resulting buildup is related to seborrheic dermatitis rather than poor hygiene.
Overactive immune signals speed up the production of scalp skin cells. The cells accumulate in thickened plaques with scale that can collect around hairs and extend beyond the hairline.
Cradle Cap. Usually develops in the first months of life.
Scalp Psoriasis. Can begin at any age as part of psoriasis; the scalp may be the first affected site.
Early-life sebum and yeast-related inflammation contribute.
Scalp psoriasis is psoriasis on the scalp. The immune system speeds up skin growth there, building thick, scaly patches.
It shares the same inherited tendency as other psoriasis.
Evidence labels come from each condition’s own treatment list.
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.
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.
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.
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.
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.
A clinician may choose an age-appropriate antifungal or brief anti-inflammatory treatment for troublesome disease.
Clobetasol Propionate. 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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 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.
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.
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.
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.
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.
Cradle cap usually clears over weeks to months without lasting harm. Persistent disease beyond infancy, marked inflammation or a rash that is spreading should prompt reconsideration of the diagnosis.
Scalp psoriasis commonly alternates between flares and quieter periods. Treatment can control scale, itch and inflammation, but symptoms may return when treatment stops. Ongoing scalp care and a maintenance plan can help sustain improvement.
Most cases settle; extensive, very inflamed or unwell infants need assessment.
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.
Seek care for bleeding, pus, significant itch, poor growth or an unwell infant.
Seek help for persistent thick scale, bleeding, sleep-disrupting itch or hair loss. Joint symptoms should also be assessed.
Infantile seborrhoeic dermatitis commonly producing greasy adherent scalp scale.
Use gentle baby shampoo and soften scale for gentle removal; do not pick or scrape.
Seek care for bleeding, pus, significant itch, poor growth or an unwell infant.
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.
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.
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.
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.
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.
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.
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