Polymorphous Light Eruption

Key Points
Somewhat common skin condition typically affecting areas exposed to sunlight
Exact cause is unknown, but is thought to be due to an immune system reaction which causes Photosensitivity
Typically consists of groups of small, elevated spots on the affected area, which are pink or red in color

Polymorphic light eruption is a common skin condition which affects areas of the body that are exposed to sunlight. The condition typically consists of groups of small, elevated spots in the affected area, which are pink or red in color. Lesions commonly form on the arms, but may appear in other areas. In rare cases lesions may appear on the face. Cutaneous symptoms will differ in every case, and may resemble Dermatitis, or lesions may be similar in appearance to a target.

The exact cause of polymorphic light eruption is unknown, but it is thought that the condition may result from an immune system reaction which causes Photosensitivity. It is more common in adult females, but may rarely develop in children and males. The condition typically appears in early spring, and commonly decreases in severity as cumulative sun exposure increases, though in severe cases symptoms may appear even in winter.

Differential Diagnosis (Other conditions with similar appearance)

Contact Dermatitis, Allergic
Lupus erythematosus, Subacute Cutaneous

Diagnosis
Key Points
Diagnosis based on characteristic appearance of the affected area
Laboratory tests may be performed to rule out other conditions

Polymorphic light eruption is typically diagnosed based on the characteristic appearance of the affected area. Laboratory tests may be performed to rule out similar appearing conditions.

Treatment
Proper Sun protection may prevent flareups
The condition does not typically require treatment, as it is often self-resolving
In severe cases, various therapies may be used in treatment
OTC Options: Suncreen, protective clothing

Polymorphic light eruption does not typically require treatment, as the condition is typically self-resolving. Proper protection from sun exposure is key in preventing the condition from becoming worse. In severe cases, various therapies such as oral steroids, polypodium leucotomas, beta carotene, Hydroxychloroquine, and UV light therapies.