Psoriasis is a chronic skin condition that usually affects the elbows, knees, scalp and lower back, but it can appear anywhere on the body. The condition causes the skin cells to multiply up to 10 times faster than normal patches of the skin. As a result, the skin develops red, flaky, and crusty patches that are covered with silvery scales. In some cases, the patches may be itchy or sore, and in severe cases, they cover large portions of the body.
