Psoriasis is a hereditary disorder of the skin with several clinical expressions. The most frequent type is psoriasis vulgaris, which occurs as chronic, recurring, scaling papules and plaques. Psoriasis vulgaris consists of acute guttate, chronic plaque, inverse, and palmoplantar. Clinical presentation varies from individuals to those with only a few localized plaques to those with generalized skin involvement. Psoriasis appears to be an auto-immune inflammatory skin disorder. The causes are genetic predisposition, physical trauma, infections, stress, drugs, dietary, environmental, and alcohol.