Psoriasis

Also called Plaque psoriasis

Psoriasis is a skin condition that causes patches of skin that are flaky and covered with scales. On white skin they often look red; on brown and black skin they can look purple or darker. They often appear on the elbows, knees, scalp and lower back. It happens when the immune system speeds up how skin cells are made. It is not contagious.

Last updated Nov 9, 2026

What it is

Psoriasis usually comes and goes in flare-ups. Triggers can include stress, infections, injury to the skin, smoking and alcohol.

Treatments include creams and ointments, light therapy, and tablets or injections for more severe psoriasis.

Common signs

  • Patches of flaky, scaly skin
  • Itching or soreness
  • Dry, cracked skin that may bleed
  • Thickened or pitted nails
  • Joint pain or stiffness

How it is usually diagnosed

  • Looking at the skin, scalp and nails
  • Sometimes a skin biopsy

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • GP or dermatology letters
  • Treatment plans
  • Blood test results if on tablets or injections
  • Photos of the skin over time

Questions to ask your doctor

  • Which treatment do you recommend for my type?
  • What might be triggering flare-ups?
  • Should my joints be checked?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Skin that becomes red or dark over most of the body, with shivering or feeling very unwell: get urgent help, call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources