skin disorders
Photosensitivity Reactions
Polymorphous light eruption
This eruption is a reaction to sunlight (primarily UVA light) that is not fully understood. It is one of the most common sun-related skin problems and is most common among women and among people from northern climates who are not regularly exposed to the sun. The eruption appears as multiple red bumps and irregular, red, raised areas (called plaques) and, rarely, as blisters on sun-exposed skin. These plaques, which are itchy, typically appear 30 minutes to several hours after sun exposure. However, new patches may develop many hours or several days later. The eruption usually goes away within several days to weeks. Typically, people with this condition who continue to go out in the sun gradually become less sensitive to the effects of sunlight (a process known as hardening). 