Psoriasis is a chronic overgrowth (hyperplasia) of the epidermis, producing large, erythematous (red) plaques with silvery scales (Fig. 21-3). The cause is unknown but there is sometimes a hereditary pattern, and autoimmunity may be involved. Psoriasis is treated with topical corticosteroids and with exposure to ultraviolet (UV) light. Severe cases have been treated with a combination of a drug, psoralen (P), to increase sensitivity to light, followed by exposure to a form of UV light (UV-A).
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Do You Suffer From the Itching and Scaling of Psoriasis? Or the Chronic Agony of Psoriatic Arthritis? If so you are not ALONE! A whopping three percent of the world’s populations suffer from either condition! An incredible 56 million working hours are lost every year by psoriasis sufferers according to the National Psoriasis Foundation.