Pemphigus foliaceus causes red spots with crusts and scale on the skin. Pemphigus vulgaris causes blisters that break easily, crusts on the skin, and raw, painful sores in the mouth, often on the gums, walls, and roof of the mouth. The skin sites most often affected are the scalp, face, chest, and back. The skin often breaks open as shallow erosions and feels raw and painful. Scars usually do not develop. While the skin can return to almost normal, darker spots may remain after the blisters go away. The mouth often heals later than the skin. You cannot spread pemphigus to other people (it is not contagious).