Causes and Prevention
It has been noted that PMLE is caused by an immune reaction to a compound in the skin which is altered by exposure to ultraviolet light. It can be provoked by UVA or UVB rays.
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.
One may also purchase clothing that has been tested for its protective qualities.
Some progression to autoimmune disease has been observed.
Read more about this topic: Polymorphous Light Eruption
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