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A member asked:
Keep getting hives at 10pm some nights on torso in area of underwear. gone by morning. swollen lip in morning. causes?
A doctor has provided 1 answer
Hives: Hives and angioedema form when, in response to histamine, blood plasma leaks out of small blood vessels in the skin. Histamine is a chemical released from specialized cells along the skin's blood vessels. Allergic reactions, chemicals in foods, insect stings, sunlight exposure, or medicines can all cause histamine release. Sometimes it's impossible to find out exactly why hives have formed.
Answered 12/27/2013
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