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10/11/08 - Psoriasis is a disease that causes an increase in skin cells on the outer layer of the skin. In a healthy person, skin cells mature and shed from the surface of the body about every 28 days; a person with psoriasis sheds skin cells every 3 to 4 days. The excess skin cells build up and form the skin lesions that are characteristic of psoriasis. More Braindrops...