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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.


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WebMD's guide to psoriasis, including types, symptoms, and causes.


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The National Psoriasis Foundation works to find a cure for psoriasis and psoriatic arthritis and to eliminate their devastating effects through research, advocacy and education.


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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.


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Find information about the types of psoriasis and their symptoms, and the treatments available to help manage your condition.


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Psoriasis is a chronic skin condition that can cause red, scaly patches of skin to appear. Learn more about what it is, why it appears, and how it’s treated.


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Psoriasis – Learn about this very common skin condition that causes skin cells to build up and form scales and itchy dry patches. Treatment may help.


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Learn more about psoriasis and why the immune system causes psoriasis to appear on the skin. Plaque psoriasis is one of the most common forms. Learn more from the National Psoriasis Foundation.


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Psoriasis is a skin disease that causes itchy or sore patches of thick, red skin with silvery scales. Some people also get psoriasis arthritis.


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Psoriasis is a skin condition that is often misunderstood; people who have psoriasis can face prejudice and discrimination.