1.impetigo 2.pemphigus foliaceus 3.lichen simplex chronicus 4.psoriasis It causes cells to build up rapidly on the surface of the skin. The extra skin cells form scales and red patches that are itchy and sometimes painful(auspitz sign). There is no cure for it, but you can manage symptoms. Lifestyle measures, such as moisturizing, quitting smoking and managing stress, may help.