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Symptoms of PMLE are a mild to severe skin rash, usually appearing within 30 minutes to several hours of sun exposure. The rash may be itchy and have these characteristics: 1  Small bumps all over the body, predominantly in sun-exposed areas.  Sun rash progresses to dense clumps of bumps.
What Causes Sunburn. You already know the simple explanation behind sunburn. When your skin is exposed to the sun for a period of time, eventually it burns, turning red and irritated. Under the skin, things get a little more complicated.