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Psoriasis is a chronic skin disease that causes skin cells to grow too quickly. In psoriasis, patches of red, thickened skin with silvery scales develop, usually on the elbows, knees, scalp, and trunk. These areas can be itchy and painful. The areas usually involved are the elbows, knees, and the skin behind the ears, the trunk, and the scalp. The disease may also affect the underarms and genital areas. Nails may become rough and pitted, and less commonly, a form of arthritis develops called psoriatic arthritis. Psoriasis can be a persistent problem, and tends to run in families. Stress, infections such as a sore throat, reaction to certain drugs, and skin injuries may trigger an attack or make it worse. Symptoms of Psoriasis Following are the major psoriasis symptoms: 1. Red and irritated skin with bright silvery scales 2. Sometimes accompanied with slight itching Causes of Psoriasis Following are the major psoriasis causes: 1. Due to abnormality in the mechanism in wh