Polymorphous light eruption

Polymorphous light eruption (PMLE) is a common skin reaction in people who are sensitive to sunlight (ultraviolet light).

Causes

The cause is unknown. Doctors think it is a type of delayed allergic reaction . It is common among young women who live in moderate (temperate) climates.

Allergic reaction

Allergic reactions are sensitivities to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, and gastroin...

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Symptoms

Polymorphous means taking on different forms, and eruption means rash. As the name suggests, symptoms of PMLE are rash-like and are different in different people.

PMLE most often occurs in spring and early summer on areas of the body exposed to the sun.

Symptoms usually appear within 1 to 4 days after exposure to sunlight. They include any of the following:

• Small bumps (papules) or blisters
• Redness or scaling of the skin
• Itching or burning of the affected skin
• Swelling, or even blisters (not often seen)

Treatment

Steroid creams or ointments containing vitamin D may be prescribed by your health care provider. They are used 2 or 3 times a day. Steroid or other types of pills may be used for more severe cases.

Phototherapy may also be prescribed. Phototherapy is a medical treatment in which your skin is carefully exposed to ultraviolet light. This may help your skin become used to (sensitized to) the sun.

Outlook (Prognosis)

Many people become less sensitive to sunlight over time.

When to Contact a Medical Professional

Call for an appointment with your provider if PMLE symptoms do not respond to treatments.

Prevention

To prevent PMLE symptoms:

• Avoid sun exposure during hours of peak sun ray intensity.
• Use sunscreen. Sun protection with broad spectrum sunblock that works against UVA rays is important.
• Apply generous amounts of sunscreen with a sun protection factor (SPF) of at least 30. Pay special attention to your face, nose, ears, and shoulders.
• Apply sunscreen 30 minutes before sun exposure so that it has time to penetrate the skin. Re-apply after swimming and every 2 hours while you are outdoors.
• Wear a sun hat.
• Wear sunglasses with UV protection.
• Use a lip balm with sunscreen.