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Psoriasis

Psoriasis is a chronic, noncontagious autoimmune skin condition characterized by dry, itchy, and scaly patches. Learn about its causes, triggers, and ways to manage flare-ups safely.

Prepared from the sources listed below. This overview is educational and is not a diagnosis or treatment plan.

Close-up of healthy skin texture reflecting calm and well-being.
Close-up of healthy skin texture reflecting calm and well-being.

Overview

A clear starting point

Psoriasis is a long-lasting, noncontagious autoimmune condition that speeds up the life cycle of skin cells, causing them to build up rapidly on the surface of the skin. This buildup forms thick, scaly patches that can be red, pink, or purple, depending on skin tone, and are often itchy or sore. The condition commonly affects the knees, elbows, trunk, and scalp. While there is no cure for psoriasis, treatments and lifestyle adjustments can help manage symptoms and reduce the frequency of flare-ups. It is not an infection and cannot be caught from or passed to others.

Four key facts

  1. 1Psoriasis is an autoimmune disease where the immune system mistakenly attacks healthy skin cells.
  2. 2The condition is not contagious and cannot be spread through physical contact.
  3. 3Common triggers for flare-ups include stress, skin injuries, certain medications, and infections.
  4. 4Some people with psoriasis may also develop psoriatic arthritis, which causes joint pain and swelling.

Useful points to discuss

Moisturize daily to prevent dry skin and help reduce scaling and itching.
Identify and avoid personal triggers, such as excessive stress or heavy alcohol consumption.
Discuss treatment options with a healthcare provider, as therapies range from topical creams to systemic medications depending on severity.

When professional care may be important

These examples are not a diagnosis checklist. New, severe, rapidly worsening, or concerning symptoms should be assessed by a qualified healthcare professional; emergencies require local emergency services.

  • If psoriasis patches become increasingly painful, swollen, or show signs of infection.
  • If you experience joint pain, stiffness, or swelling, which could indicate psoriatic arthritis.
  • If your symptoms significantly impact your daily life, sleep, or mental well-being.

Source trail

Authoritative references

Source publishers and titles are listed as non-clickable references so this page never sends visitors to another website.

  1. 1. Mayo ClinicPsoriasis - Symptoms and causesPublished or updated 2025-12-17
  2. 2. NHSPsoriasis
  3. 3. MedlinePlusPsoriasis | Psoriatic ArthritisPublished or updated 2019-02-20