Polymorphic light eruption (PLE), otherwise termed polymorphous light eruption (PMLE), is a skin complaint caused by sunlight. Typically, those affected by it will have been exposed to the sun for two to three days while on holiday, It can even be brought on by sunlight penetrating through a window or thin clothing.

A delayed-onset, spotty, itchy eruption appears on the skin, and may take between 5 to 10 days to clear. The rash usually consists of small red spots or blisters and can appear on any part of the body that has been exposed to sunshine, although commonly the face and the backs of the hands will be spared. It tends to heal without scarring.