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. Damage to the nail plate, bed or surrounding tissue from injury.
The same eight facts on every condition comparison.
Pitting Tiny dents in the nail surface.
Oil drop spots Yellow-brown patches under the nail.
Lifting The nail separates from the bed.
Nail Trauma The nail has a central dark patch with lighter discoloration near the edge.
Psoriasis-related inflammation can affect both the nail matrix, where the nail grows, and the nail bed beneath it. This alters nail formation and attachment, causing features such as pits, debris, discoloration or lifting.
Impact, pressure or repeated injury damages the nail plate, nail bed or growth area. The visible change depends on which part of the nail unit is injured.
Nail Psoriasis. Can occur at any age with psoriasis and may occasionally precede visible skin disease.
Nail Trauma. Can occur at any age after injury.
Nail psoriasis is psoriasis that affects the cells that build the nail. The same immune overreaction that causes skin plaques disrupts how the nail grows.
Impact, pressure or repetitive injury damages the nail unit.
It shares the same inherited tendency as skin psoriasis.
Evidence labels come from each condition’s own treatment list.
Protect the injured nail. Significant pain, an open wound or a crush injury may need assessment for nail-bed damage or fracture; unexplained nail pigment needs diagnosis rather than injury treatment.
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.
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.
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.
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.
Clobetasol Propionate. 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.
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.
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.
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.
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.
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.
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.
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 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.
Steroid injection in nail fold. 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.
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. 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.
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.
Recovery follows nail growth, so visible damage can take months to move out. Injury to the nail-producing area can leave lasting changes; significant pain, an open injury or persistent unexplained pigment needs review.
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.
A significant injury may include a fracture or nail-bed wound.
Seek assessment for new nail changes or painful swollen joints. Nail samples may be needed because fungal infection can look similar or coexist.
Get care for severe pain, a crush injury, an open wound or unexplained pigment that does not move with nail growth.
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.
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.
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.
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.
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.
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.
Damage to the nail plate, bed or surrounding tissue from injury.
Protect the nail, use roomy footwear and do not drill or burn a hole in it yourself.
Get care for severe pain, a crush injury, an open wound or unexplained pigment that does not move with nail growth.
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