Psoriasis

Psoriasis is a long-lasting, noncontagious autoimmune disease characterized by patches of abnormal skin. These areas are red, pink, or purple, dry, itchy, and scaly. Psoriasis varies in severity from small localized patches to complete body coverage.

Injury to the skin can trigger psoriatic skin changes at that spot, which is known as the Koebner phenomenon.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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