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A member asked:
I have noticed medium sized light purple blotches suddenly appearing with seemingly no cause and disappear/fade between a few minutes and an hour.
A doctor has provided 1 answer
Urticaria: When you have an allergic reaction to a substance, your body releases histamine and other chemicals into your bloodstream. This causes itching, swelling, and other symptoms. Hives are a common reaction, especially in people with other allergies such as hay fever.
Answered 3/26/2013
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