Polymorphous light eruption
|Polymorphous light eruption|
|Classification and external resources|
Polymorphous light eruption (PLE), or polymorphic light eruption (PMLE), is a skin condition caused by sunlight.
Two subtypes have been described:
- Juvenile spring eruption is a cutaneous condition that affected the helices of the ears, particularly in boys because their ears are relatively more exposed to sunlight.
- Benign summer light eruption is a cutaneous condition, and a name used in continental Europe, and particularly France, to describe a clinically short-lived, itchy, papular eruption particularly affecting young women after several hours of sunbathing at the beginning of summer or on sunny vacations. After a person experiences this condition once, it will likely recur annually. Onset is generally in the teen years or 20s; the condition can then last the remainder of a person's life, with annual flare-ups after the first exposure to the sun each year.
Signs and symptoms
Symptoms include skin irritations, which may be itchy or painful, and are sometimes confused with hives. These irritations appear upon or after exposure to sunlight, and may last from 1 to 7 days. Secondary symptoms include fever, dizziness, exhaustion and disorientation.
The cause of PLE is not yet understood. It is thought to be due to a type IV delayed-type hypersensitivity to an allergen produced in the body following sunlight exposure. It can be provoked by UVA or UVB rays. Some progression to autoimmune disease has been observed.
Generally, PLE resolves without treatment; also, PLE irritations generally leave no scar.
Typically, 5-20% of fair skinned populations are affected, but it can occur in any skin type. It is more common in females than in males. The condition can affect all ethnic groups and research suggests that 20% of patients have a family history of the complaint. Those suffering from PLE usually do so by age 30.
- Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0.
- Schornagel IJ, Sigurdsson V, Nijhuis EH, Bruijnzeel-Koomen CA, Knol EF (July 2004). "Decreased neutrophil skin infiltration after UVB exposure in patients with polymorphous light eruption". J. Invest. Dermatol. 123 (1): 202–6. doi:10.1111/j.0022-202X.2004.22734.x. PMID 15191561.
- Hasan T, Ranki A, Jansen CT, Karvonen J (September 1998). "Disease associations in polymorphous light eruption. A long-term follow-up study of 94 patients". Arch Dermatol 134 (9): 1081–5. doi:10.1001/archderm.134.9.1081. PMID 9762018.
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