This is quite a rare condition in which itchy bumps occur mainly on exposed skin, which can persist for many months and can leave scars when they disappear. It is commoner in children. Sometimes patients or their relatives may have polymorphic light eruption too (see above for details). Treatments include broad spectrum sunscreens, steroid creams and , in severe cases, tablets such as prednisolone or thalidomide. Sometimes hospital ultraviolet light treatment can help.