Pityriasis amiantacea

Pityriasis amiantacea begins with a swollen, discoloured and weeping scalp, which causes the hairs to stick to each other and to the scalp. Following the first stage, the scalp begins to produce a thick layer of silvery white or dull gray scales that pile up along the hair shafts. Although the patches may often be found next to a hair part, the back of the head is a common site. Rather than spreading to the rest of the scalp, a fine, branny scale appears over the unaffected area.