Then they “pile up” and form thick, crusty patches (plaques) of gray or silver scabs on the skin. Psoriasis plaques are most often on the elbows, knees, trunk, and scalp. Flare-ups tend to be ...

Scabs on the scalp can be caused by inflamed hair follicles or inflamed skin. It can also be caused by infestations of lice or an infection called scalp ringworm. In rare cases, scabs that bleed ...