Psoriasis capitis

The head is one of the commonest seats of the disease, next to the elbows and the knees; the whole scalp may be affected, or there may be only one or two small points of eruption; when extensive, the disease travels on to the forehead, forming a kind of fringe along it at the upper part. There is coexistent disease elsewhere. The hair on the scalp thins out frequently when psoriasis attacks it.