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A member asked:
Help please? how long does swelling from an allergic reaction last?
A doctor has provided 1 answer
Fairly quickly: Swelling after an allergic reaction usually resolves within 24 hrs of exposure. Swelling that persists for days is not likely IgE-mediated (allergic) and might be due to other causes. See an allergist if you are concerned about persistent swelling/angioedema.
Answered 5/3/2019
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