Psoriasis is a chronic autoimmune disease in which the body overproduces skin cells, causing thick, red, dry, scaly patches of inflammation on the skin. Almost 8 million Americans have psoriasis. Psoriasis sufferers with less than 2% of their body affected are considered to have a mild case; those with 3% to 10% of their body affected are considered to have a moderate case, while those with more than 10 percent of their body affected are considered to have a serious case of psoriasis.
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