Psoriasis is a skin condition characterized by patches of red skin covered with white, flaky dead skin cells. It occurs most often on the scalp, knees, elbows, and torso and can be itchy and painful. Psoriasis is an autoimmune disease that affects approximately 7.5 million Americans according to the American Academy of Dermatology. Despite its prevalence, there are still many myths surrounding this disease. Here, we give you the facts.