Not everyone has a rash-inducing response to UV light.
It usually occurs due to a genetic condition or taking certain medications.
About 10% to 20% of the population in the United States is prone to sun rash.
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Poisoning vs. PMLE
Asun allergyis triggered by the body’s immune response to sun exposure.
Reproduced with permission from © DermNetdermnetnz.org2023.
PMLE is the most common pop in of sun allergy, but not all sun allergies are PMLE.
Other sun allergies include:
Sun poisoningis more serious than a typical sun allergy or seasonal sun rash.
Getting poisoned by UV exposure causes severe sunburn and intense whole-body symptoms that usually require immediate medical attention.
Reproduced with permission from © DermNetdermnetnz.org2023.
Potential Causes
The primary cause of a sun rash is an immune reaction triggered by UV radiation.
When Do Symptoms Appear?
Under a microscope, clinical signs of a sun rash can be identified 48 hours after UV exposure.
How Long Do They Last?
Summary
A sun rash is sparked by UV light.
It usually feels itchy and looks bumpy, with small raised spots or patches of discolored skin.
Most sun rashes go away on their own in a few days.
Aloe vera gel or anti-itch creams can help soothe the skin.
Cool compresses can also reduce inflammation and relieve itching.
Seek medical attention if a sun rash causes severe symptoms.
2021;12(2):211-219. doi:10.4103/idoj.IDOJ_434_20
U.S. Department of Veterans Affairs.Sunburn (sun poisoning).
Blakely KM, Drucker AM, Rosen CF.Drug-induced photosensitivityan update: culprit drugs, prevention and management.Drug Saf.
2000;115(3):467-470. doi:10.1046/j.1523-1747.2000.00079.x
Rajan R.Effects of sun exposure in skin of colour.
In:Sunscreens for Skin of Color.
Merin K, Shaji M, Kameswaran R.A review on sun exposure and skin diseases.Indian Journal of Dermatology.
2022;67(5):625. doi:10.4103/ijd.ijd_1092_20
American Osteopathic College of Dermatology.Polymorphous light eruption.
Contemporary Pediatrics.Juvenile spring eruption in a young boy.
Ling TC, Dawe RS, Gardener E, Rhodes LE.Interventions for polymorphic light eruption.
Cochrane Skin Group, ed.Cochrane Database of Systematic Reviews.
Published online October 9, 2017. doi:10.1002/14651858.CD005069.pub3
Dermatology Times.OTC treatment options for pesky summer rashes.
2012;109(42):17111-17116. doi:10.1073/pnas.1206851109
Robinson JK.Sun safety.JAMA Dermatol.
