Psoriasis is meant by

Psoriasis is a skin disease, chronic, characterized by the appearance of areas of inflamed reddish color that are covered with silvery scales, a kind of bright, that are particularly on the elbows, knees, scalp and lower back. Grows in clumps, with periods of exacerbation alternating with less active. It is not an infectious or contagious disease is not usually fatal or causes serious consequences, although in severe cases can have a significant social impact.