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Polymorphous light eruption

Polymorphic light eruption; Photodermatosis; PMLE

 

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.

 

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.

 

 

References

Gruber-Wackernagel A, Burne SN. Polymorphous light eruption: clinic aspects and pathogenesis. Dermatol Clin. 2014;32:315-34. PMID: 24891054 www.ncbi.nlm.nih.gov/pubmed/24891054.

Morison WL, Richard EG. Polymorphic light eruption. In: Lebwohl MG, Heymann WR, Berth-Jones J, Coulson I, eds. Treatment of Skin Disease: Comprehensive Therapeutic Strategies. 4th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 189.

 
  • Polymorphic light eruption on the arm

    Polymorphic light eruption on the arm - illustration

    The cause of polymorphous light eruption is unknown. It usually appears 1 to 2 days following exposure to sunlight and may last up to one week. It is more common during adolescence and young adulthood, and occurs more frequently in females. It appears as recurrent redness (erythematous) and/or blistered patches (plaques). It may be an inherited disease in certain Native American groups.

    Polymorphic light eruption on the arm

    illustration

    • Polymorphic light eruption on the arm

      Polymorphic light eruption on the arm - illustration

      The cause of polymorphous light eruption is unknown. It usually appears 1 to 2 days following exposure to sunlight and may last up to one week. It is more common during adolescence and young adulthood, and occurs more frequently in females. It appears as recurrent redness (erythematous) and/or blistered patches (plaques). It may be an inherited disease in certain Native American groups.

      Polymorphic light eruption on the arm

      illustration

    A Closer Look

     

      Talking to your MD

       

        Self Care

         

          Tests for Polymorphous light eruption

           

             

            Review Date: 4/14/2015

            Reviewed By: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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