Antihistamine: A hives allergic reaction is very likely. Watch for breathing/swallowing difficulty, itching and vomiting. If these occur, please see the ED. The response to antihistamine indicates a possible allergic reaction. Continue to take the antihistamine for a few more days, since allergic reactions may take days to weeks to clear up. Avoid contact with any possible triggers, including new food exposure.
Answered 11/8/2020
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