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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.
On more than one occasion my skin was affected by serious sunburns. I had fever and I was in a lot of pain, but I have never experienced swelling due to sunburn. But, a thing like this can happen in the hardest sunburn cases. You see ultraviolet lights that cause sunburns actually hurt our skin cells. Our immune system sees this as a threat and reacts. The swelling is one of the signs of inflammation. The mechanism of this immune system reaction is very complex.