Psoriasis is a long-lasting autoimmune disease characterized by patches of abnormal skin. These skin patches are typically red, itchy, and scaly. Psoriasis varies in severity from small, localized patches to complete body coverage.
Get information on psoriasis causes, treatment, medication, and types: scalp, vulgaris, guttate, inverse, and pustular. Red dry flakes, skin scales, and plaques of raised skin are common symptoms and signs.