Condition

Nail Psoriasis

Nail psoriasis is psoriasis affecting the nails. It causes pitting, lifting, crumbling, and yellow-brown patches under the nail. It is often mistaken for a fungal infection, and it improves slowly because a nail has to grow out before you can see the result.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026

Start here

Nail psoriasis is the part of psoriasis people apologize for - elbows get shown readily, hands get hidden. Two things are worth knowing up front. A nail is not fungus just because it looks like fungus, and roughly half the thickened, discolored nails sent to me are not fungal at all, so test before committing anyone to months of antifungal treatment. The second is patience - the nail you see is already made, treatment only changes the nail that has not grown out yet, and a fingernail takes around six months to replace itself, a toenail a year or more.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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How commonAbout half of people with psoriasis have nail changes at any given time, and most develop them at some point
Who gets itPeople with psoriasis, especially those with long-standing disease, scalp involvement, or psoriatic arthritis. It occurs in children too, though less often
Curable or managedManaged - nails can be brought back close to normal, and the change is usually gradual
Prescription neededUsually. Over-the-counter products can protect a nail but do not treat the inflammation causing the damage
Time to improveSix months or more for a fingernail, a year or more for a toenail - the nail has to grow out

What It Is

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Nail psoriasis is psoriasis in and around the nail. The nail is not alive - it is a hard sheet made by a small factory under the skin at the base, the nail matrix, resting on skin underneath, the nail bed. Psoriasis inflames one or both, and the damage shows up in the nail that gets made.

Where the inflammation sits decides what you see. In the matrix you get surface faults: small dents called pitting, ridges, white patches, and in bad cases a crumbling nail. In the bed you get color and lifting: a yellow-pink patch like a drop of oil under the nail, chalky buildup that thickens it, separation from the skin at the tip, and thin red-brown lines called splinter hemorrhages.

Most people have a few nails affected rather than all, and the pattern shifts over the years. Nails may be sore, tender to press, or catch on things, and buttons, keyboards and small objects get harder when a nail is lifted or crumbling.

One thing matters beyond appearance. Nail psoriasis is more common in people who have or go on to develop psoriatic arthritis, particularly in the joint nearest the nail, so new joint pain or swelling is worth mentioning rather than waiting out.

Symptoms

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Small dents in the nail

Pitting

Tiny pinprick dents scattered across the nail surface, as though pressed in with a pin. It is one of the earliest and most common signs. Several nails are usually involved.
Yellow-pink patches under the nail

Oil Drop and Discoloration

Salmon-pink or yellow patches under the nail plate that look like a drop of oil trapped beneath it. This sign is quite specific to psoriasis. It can appear before any skin patches do.
Crumbling, separating nails

Thickening and Lifting

The nail thickens, crumbles and lifts away from the bed, collecting debris underneath, which is easy to mistake for a fungal infection. The two can also occur together. Nail changes with joint pain are worth mentioning to a doctor.

Where It Shows Up

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Front view of a whole body with red marks on both hands and fingers and on both feet. The rest of the body is clear.
Fingernails more than toenails, and usually several at once
Fingernails are affected more often than toenails, and several nails are usually involved rather than one. That is one of the things that separates it from nail fungus, which tends to start in a single toenail.
Front view of a whole body with red marks on both elbows, both knees and the scalp. The rest of the body is clear.
Check the elbows, knees and scalp too
Nail changes often come with psoriasis somewhere else, most often on the outside of the elbows and knees, the scalp and the lower back. They also travel with psoriatic arthritis, so new joint pain and stiffness alongside nail changes is worth mentioning.

Causes

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The cause is the same immune overactivity that drives psoriasis anywhere. Immune signals - interleukin 17 and interleukin 23 among them - switch on inflammation, and skin cells respond by multiplying far faster than normal. In the nail unit, that inflammation lands on one of two structures, and which one decides what the nail looks like.

The nail matrix sits under the skin at the base and manufactures the nail plate. Inflamed, it makes the nail badly. Clusters of faulty cells reach the surface and fall out, leaving small pits. More inflammation gives ridges, white patches and a nail that crumbles.

The nail bed is the skin the nail sits on. Inflamed, scale builds up underneath and the nail loses its grip. That gives the oil-drop patch, the chalky buildup that lifts and thickens the nail, and separation at the tip. Tiny burst vessels leave the thin red-brown lines called splinter hemorrhages.

Injury matters in the nails as it does on the scalp. Psoriasis appears where skin has been damaged, so aggressive manicures, picking at a lifted nail, nail biting and pressure from tight shoes can start or worsen it. Once a nail lifts, the gap underneath is easily colonized by yeast or bacteria, which adds discoloration and confuses the picture.

Risk Factors

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Nail psoriasis happens to people who have psoriasis. What varies is who among them gets it.

Psoriasis pattern
Having psoriasis for a long time
The longer you have had it, the more likely nails are involved.
Psoriasis pattern
Psoriatic arthritis
Strongly linked, particularly arthritis in the joint closest to the nail.
Psoriasis pattern
Scalp psoriasis
Scalp and nail involvement often travel together.
Psoriasis pattern
Psoriasis in skin folds or near nails
Disease close to the nail unit raises the chance.
Habits & products
Injury to the nail
Aggressive manicures, cuticle cutting, nail biting, picking, pressure from footwear.
Habits & products
Smoking
Linked to more severe psoriasis and to treatments working less well.
Inherited
Family history
Psoriasis clusters in families, and so does the nail pattern.
Age
Age
More common in adults, though children do get it.

Course

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Nail psoriasis moves on the nail's timescale. With treatment a healthy band appears at the base and pushes the damaged nail forward, so progress is judged at the cuticle. Months, not weeks.

Left untreatedNo treatment
It tends to persist

It usually persists and can slowly worsen, though individual nails sometimes settle. Flares track with psoriasis elsewhere, so when the skin is bad the nails follow.

The first months of treatmentNothing visible yet
The nail you see was made months ago

Nothing you do today changes the nail you are looking at. It changes the nail being made now, which will not reach the tip for months.

Base of the nailUnder the cuticle
About six monthsFingernails
A new fingernail has replaced itself

A fingernail grows roughly three millimeters a month and replaces itself in about six months. Pitting and surface faults, from the matrix, often improve before thickening and lifting, from the bed.

Fingernails
A year or moreToenails
Toenails lag behind

A toenail is slower and can take a year or more, so it is judged on its own timescale.

Toenails
Long termYears
Most nails improve substantially

Many return to normal or close to it. Permanent scarring is uncommon but follows years of severe untreated disease. Because nail involvement is linked to psoriatic arthritis, ongoing joint pain, swelling of a whole finger or toe, or morning stiffness lasting more than half an hour is worth reporting early.

NailsFinger and toe joints

What Makes It Better & Worse

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Nail psoriasis is four problems - inflammation in the matrix, inflammation in the bed underneath, the nail lifting away, and injury and pressure. Most of what you control sits in steps 3 and 4, and needs no prescription.

1Inflammation in the nail matrix

What helps

  • Leave the cuticles alone The cuticle protects the matrix.
  • A high-potency topical steroid Applied to the nail folds.
  • Steroid injections into the nail fold Effective for pitting in a few stubborn nails.
  • Treating the psoriasis systemically Pills and biologics beat topicals here.
  • Photograph the nails every two months Change is too slow to see day to day.

What makes it worse

  • Aggressive manicures Cutting cuticles injures the skin over the matrix.
  • Gel and acrylic nails Filing, soaking and removal stress the nail.
  • Stopping treatment early Change takes months; week eight tells you nothing.
  • A flare of psoriasis elsewhere Nails worsen when skin disease is active.
  • Smoking and heavy alcohol use Linked with more severe psoriasis and poorer response.

2Inflammation in the nail bed

What helps

  • Calcipotriene, a vitamin D treatment Useful for thickening and buildup.

3The nail lifting away from the bed

What helps

  • Keep nails short and filed smooth They catch less, so they lift less.
  • Trim the lifted part of the nail back Removes the pocket where debris collects.
  • Wear gloves for wet work and cleaning Protects the seal around the nail.
  • Moisturize the nail folds and nail Less cracking, less brittleness.
  • Test for fungus before assuming Antifungals only help if fungus is there.

What makes it worse

  • Cleaning under a lifted nail A sharp tool pushes the separation back.
  • Leaving lifted nails long Every catch pulls the nail further off.
  • Wet work and detergents Water softens the nail and loosens the seal.
  • An untreated infection under the nail Adds discoloration and odor.

4Injury and pressure on the nail

What helps

  • Regular nail polish, if you want it Covers discoloration, adds a little protection.
  • Roomy shoes and proper-length socks Taking pressure off does more than people expect.

What makes it worse

  • Picking, biting and pulling at the nail All injury, and injury feeds psoriasis.
  • Tight or narrow shoes Pressure is why toenails are often worse.

Over-the-Counter Products

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Everything here you can buy without seeing anyone.

Four ointments on white: CeraVe Healing Ointment, a Vaseline jar, a petroleum jelly tube and Aquaphor16:9 hero for Petrolatum. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
Rubbed into the nail folds and the nail itself at night, it keeps the skin around the nail from cracking and makes a brittle nail less likely to split. It does nothing to the inflammation underneath. Its real value here is that it protects the seal around the nail, which is the part you can influence without a prescription.
Five white jars of 40% urea cream lined up, several also listing 2% salicylic acid
Urea 40% nail softener
Limited evidence
A strong urea cream softens a thick, crumbling nail so the lifted part can be trimmed back to where it is still attached. That removes the pocket where debris collects and stops the nail catching. It treats none of the psoriasis, and it is used alongside a prescription rather than instead of one.
Regular nail polish
Regular nail polish
Weak evidence
Ordinary polish is allowed and many people use it to cover discoloration, which is a reasonable thing to want. It also adds a thin layer of protection to a fragile nail. Gels and acrylics are the ones to avoid, because of the filing, soaking and removal rather than the color.
Biotin supplements
Biotin supplements
Weak evidence
Biotin is widely sold for nails, and it has been studied mainly in brittle nails rather than in psoriasis. It does nothing about the inflammation that is damaging the nail here. Unless you are actually deficient, which is rare, this is not treatment for nail psoriasis.

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
Moderate evidence
A strong steroid, applied to the skin of the nail folds rather than to the nail, because that is where it can reach the matrix underneath. It is the usual first prescription and it helps pitting and ridging most. It is used in courses rather than continuously, since long unbroken use thins the skin around the nail.
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 works best on the nail bed problems — the chalky buildup that thickens and lifts the nail. It is often paired with a steroid, or alternated with one, so the steroid can be rested. Expect months, not weeks, and judge it on the new nail at the base.
16:9 hero for Tazarotene. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Tazarotene works in the skin
Limited evidence
A retinoid applied around and under the edge of the nail, studied in small trials that showed some improvement in lifting and pitting. It is a reasonable third option when steroids have not been enough. It commonly irritates the skin of the nail folds, and it is not used if you are pregnant or trying to be.
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.
Moderate evidence
A tablet with nail results measured directly in its trials, which is more than can be said for most options. It suits people who want something systemic without blood test monitoring. Nausea, loose stools and headache are common in the first few weeks and usually settle, and nail improvement is judged at six months, not six weeks.
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 newer daily tablet for moderate to severe psoriasis, with nail improvement recorded in its studies alongside the skin. It is an option when a tablet is preferred to an injection. It is expensive, and it usually has to be approved by insurance after other treatments have been tried.
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
An old, cheap weekly tablet that helps nails and also helps psoriatic arthritis, which is why it is often chosen when the joints are involved too. It needs regular blood tests, folic acid alongside it, and no alcohol excess. It is not used in pregnancy, and it must be stopped well before trying to conceive.
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.
Limited evidence
It works quickly and can improve badly affected nails, but nails take a year to show it, and cyclosporine is only meant for short stretches because of its effect on blood pressure and the kidneys. That mismatch is why it is rarely the choice for nails alone. It is mainly used to settle severe psoriasis while something longer-term is started.
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 injection given every other week, and one of the treatments with the best measured results in nails specifically. It also treats psoriatic arthritis, so it is a common choice when nails and joints are both involved. It needs screening for tuberculosis and hepatitis before starting, and it slightly raises the risk of infections.
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 newer biologic given every twelve weeks after the first doses, which suits people who do not want frequent injections. Nail clearance in its trials was substantial, though it lagged the skin by several months, exactly as nail growth predicts. Screening before starting is the same as for the other biologics.

Procedures

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

Steroid injection in nail fold
Moderate evidence
Small injections into the skin at the base of the nail, placing the steroid right over the matrix. It is the most effective option for pitting and ridging in one or two stubborn nails, repeated every four to six weeks for a few rounds. It stings, and it is impractical when many nails are involved.
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.
Weak evidence
Light treatment works well for psoriasis on the skin, but the nail plate blocks most of the light from reaching the matrix and nail bed beneath it. Nails are the area where phototherapy performs worst. It is worth having for widespread skin psoriasis, but do not expect it to be the thing that fixes the nails.
Removing the nail
Weak evidence
Taking the nail off does not treat the inflammation underneath, so the replacement nail grows back with the same disease in it. It is also painful and leaves the fingertip unprotected for months. It is done occasionally for a specific problem, but it is not a treatment for nail psoriasis.

When to See a Dermatologist

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Nail changes are worth looking at properly rather than guessing, because psoriasis and fungal infection are treated completely differently and a clipping tells them apart. Book if your nails are thickening, lifting, pitting, crumbling or changing color, if a nail hurts or is tender to press, if the changes get in the way of work or daily tasks, if a nail is swollen, red and sore at the edge, or if months of antifungal treatment have changed nothing. Book without waiting if you develop joint pain, a swollen finger or toe, or morning stiffness lasting more than half an hour, because nail psoriasis is linked to psoriatic arthritis and early treatment protects the joints. One change is never watched - a single new dark band running the length of one nail, widening or uneven in color, or pigment spreading onto the skin around the nail.

— Dr. Schwarz, Board Certified Dermatologist

Complications

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Psoriatic arthritis

Nail psoriasis is strongly linked with arthritis in the joint nearest the nail, because the nail unit and that joint sit closer together than they look. It shows as joint pain, a whole finger or toe swelling up like a sausage, or morning stiffness lasting more than half an hour. It is worth reporting early rather than waiting it out, because treating it early is what protects the joints.

Infection under a lifted nail

Once a nail has lifted, the gap underneath is a warm, damp space that yeast, bacteria and fungus are happy to occupy. That adds green, brown or black discoloration and sometimes an odor on top of the psoriasis, and the nail stays discolored until both are treated. Trimming the lifted part back removes the pocket; digging underneath with a sharp tool makes it bigger.

Permanent nail scarring

If the matrix is inflamed hard enough for long enough, the tissue that makes the nail can be scarred, and the nail then grows back ridged, short or misshapen even after the psoriasis is controlled. It is uncommon, and it usually follows years of severe untreated disease. It is a reason to treat rather than something to expect.

Hiding your hands

This is the part of psoriasis people apologize for. Nails are hard to cover and awkward to explain, and lifted or crumbling nails also make buttons, keyboards, zips and picking up small things genuinely harder. It is a fair reason to ask for treatment, and it is worth saying out loud at the appointment, because how much a nail bothers you changes what is reasonable to offer.

Lookalikes

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Nail Fungus (Onychomycosis)

The one this is confused with constantly, in both directions. Both give a thick, yellow-brown, crumbling, lifted nail. Psoriasis is more likely when several nails are involved at once, when there is pitting or an oil-drop patch, and when there is psoriasis on the scalp, elbows or knees. Fungus more often starts in one big toenail and works back from the tip. Only a nail clipping sent for testing settles it, and both can be in the same nail at the same time.

Nail damage from injury or habit

Repeated pushing at the cuticle, nail biting, or one bad knock produces ridges, dents and a rough nail that can pass for psoriasis. The clue is the pattern: injury usually affects one nail, or both thumbs in the same way, with an orderly line of ridges running across the nail rather than dents scattered at random. There is no oil-drop patch, and the skin elsewhere is clear.

Myths

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  • "A thick, discolored nail is always fungus." It often is not. Psoriasis, repeated injury and other skin conditions all produce nails that look fungal. A clipping sent for testing settles it, and it is worth doing before months of antifungal treatment.
  • "Nail psoriasis and nail fungus can't both be there." They can, and reasonably often are. A lifted psoriatic nail leaves a gap that yeast and bacteria occupy. When both are present, both need treating or the nail stays discolored.
  • "The nail is damaged, so it's ruined for good." Usually not. The visible nail cannot be repaired, but the nail being made underneath can be normal. Permanent scarring is uncommon and usually follows years of severe untreated disease.
  • "Trimming a lifted nail makes it worse." The opposite. Trimming back to where the nail is still attached removes the pocket where debris collects and stops further catching. Digging underneath with a sharp tool is what harms.
  • "I can't wear nail polish." Ordinary polish is fine, and many people use it to cover discoloration. Gels and acrylics cause the problems, from the filing, soaking and removal rather than the color.
  • "Nothing can be done about nails." Outdated. Topical combinations, injections into the nail fold and modern systemic treatments all improve nails, and nails respond notably well to systemic treatment. The catch is time.
  • "It's contagious." Psoriasis is not contagious in any form. You cannot pass it on through contact, shared towels, or a nail salon.

Questions Patients Ask

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Is it psoriasis or is it fungus?

They look similar, and the only reliable way to tell is a clipping sent for testing. Some features lean toward psoriasis - pitting across several nails, an oil-drop patch, psoriasis elsewhere - but none are proof. You can have both at once, which is why testing first is worth it.

Will my nail go back to normal?

Often it gets close, and many nails return to normal. The visible nail cannot be repaired, so improvement comes as healthy nail grows from the base. Nails severely affected for years are least likely to fully recover, and permanent scarring is possible but uncommon.

Why is treatment so slow?

You are waiting on nail growth, not on the medicine. A fingernail grows about three millimeters a month and replaces itself in roughly six months; a toenail can take a year or more. Treatment works on the new nail immediately, but that nail is still under the skin.

Can I wear nail polish or get a manicure?

Regular polish is fine and a reasonable way to cover discoloration. Skip gels and acrylics, and ask that cuticles are not cut or pushed back - that skin sits over the part that makes the nail, and injuring it can worsen the psoriasis.

Does nail psoriasis mean I will get psoriatic arthritis?

No, but nail involvement raises the chance, especially arthritis in the joint nearest the nail. That is a reason to mention joint symptoms early, not to worry. Joint pain, a swollen finger or toe, or morning stiffness lasting more than half an hour should be assessed, because early treatment protects the joints.

Should the nail be removed?

Almost never. Removing a nail does not treat the inflammation underneath, the replacement grows back with the same disease, and it is painful. It is occasionally done for a specific problem, but not as treatment.

References

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