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A.D.A.M. Medical Encyclopedia [Internet]. Atlanta (GA): A.D.A.M.; 2013.

A.D.A.M. Medical Encyclopedia.

Polymorphic light eruption

Polymorphous light eruption

Last reviewed: May 13, 2013.

Polymorphic light eruption is a common skin reaction in persons who are sensitive to sunlight (ultraviolet light).

Causes, incidence, and risk factors

The cause is unknown. Doctors think it is a type of delayed allergic reaction.

Symptoms

Small red pimples and blisters appear on the skin within 1 to 4 days after exposure to sunlight. The lesions may also appear as scaly skin.

Treatment

Steroid creams or ointments may be prescribed by your health care provider. They are used 2 or 3 times a day. Steroid 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.

Expectations (prognosis)

Many persons become less sensitive to sunlight over time.

Prevention

  • 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. The higher the SPF, the greater the protection.
  • 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 sun hats.
  • Wear sunglasses with UV protection.
  • Use a lip balm with sunscreen.

References

  1. James WD, Berger TG, Elston DM, eds. Andrews' Diseases of the Skin: Clinical Dermatology. 11th ed. Philadelphia, Pa.: Elsevier Saunders; 2011:chap 3.

Review Date: 5/13/2013.

Reviewed by: Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

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Copyright © 2013, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics and subscribes to the principles of the Health on the Net Foundation (www.hon.ch).

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only — they do not constitute endorsementscof those other sites. © 1997–2011 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

Copyright © 2013, A.D.A.M., Inc.

Figures

  • Polymorphic light eruption on the arm.

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