Polymorphous light eruption

Polymorphous Light Eruption

File:Polymorphous light eruption.jpg

Polymorphous light eruption on arm

Polymorphous light eruption (PMLE) is a skin condition that occurs as an allergic reaction to the sun. It is one of the most common photodermatoses and affects approximately 10-20% of the U.S. population.

Symptoms

PMLE typically manifests as an itchy rash on sun-exposed skin. The rash can take many forms, including small red bumps, blisters, or red patches. Symptoms usually appear within hours of sun exposure and can last for several days.

Causes

The exact cause of PMLE is not known, but it is believed to be an immune system reaction triggered by exposure to ultraviolet (UV) radiation from the sun or artificial sources. It is more common in people with fair skin and those living in northern latitudes.

Diagnosis

Diagnosis of PMLE is usually based on the appearance of the rash and a history of sun exposure. In some cases, a skin biopsy or phototesting may be performed to confirm the diagnosis.

Treatment

Treatment for PMLE includes avoiding sun exposure, using sunscreens, and in some cases, taking medications such as corticosteroids or antihistamines to reduce inflammation and itching. Phototherapy, a treatment that involves controlled exposure to UV light, may also be used to desensitize the skin.

Prevention

Prevention strategies for PMLE include avoiding sun exposure during peak hours, wearing protective clothing, and using broad-spectrum sunscreens.

See also

• Photodermatitis
• Sunburn
• Photosensitivity