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A member asked:
Why do i have one hive on my upper abdomen? it's been there for 5 days now and i'm not having any other allergic reactions.
5 doctors weighed in across 2 answers
Determine cause: Hives are caused by the release of a substance called histamine, which causes the characteristic "wheal and flare" skin reaction. Allergy tests are almost always negative, in my experience. If long-acting antihistamines have not worked, your hives may be due to an internal trigger, and your doctor will need to run some tests to find it.
Answered 12/10/2013
4.9k views
Hive: One hive is a rare occurence by itself, having it last five days is also uncommon, you need to have your rash examnpined tomdetermine what it is, it may not be a hive.
Answered 9/19/2013
4.9k views
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