Definition
By Mayo Clinic staffSun allergy is a condition in which sunlight triggers a skin reaction. For most people, sun allergy symptoms include an itchy red rash in areas that have been exposed to sunlight. A severe sun allergy may cause hives, blisters or other symptoms. There are several types of sun allergy — including polymorphic light eruption (PMLE), actinic prurigo, chronic actinic dermatitis (CAD) and solar urticaria.
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