Scalp psoriasis causes

According to the Psoriasis Association, psoriasis affects 2% to 3% of the UK population. Of these people, about half have scalp psoriasis. Although this condition has long been misunderstood, scientists now believe psoriasis is caused by a defect in the immune system that causes an overproduction of skin cells. This leads to inflammation and the buildup of large, silvery plaques on the skin’s surface, especially on the knees, elbows and scalp. The severity of scalp psoriasis can vary from slight scaling to thick, crusted plaques. Scalp psoriasis may look similar to seborrhoeic dermatitis, but there are differences. While seborrhoeic dermatitis scales usually appear yellowish and greasy, psoriasis scales generally appear powdery with a silvery sheen.