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Anaphylactoid reaction to ethanol.

We studied a 14-year-old boy who developed a pruritic rash and facial swelling after ingestion of beer or wine. A blinded challenge with purified ethanol was positive demonstrating ethanol itself to be the offending agent. An IgE-mediated reaction to ethanol or one of its metabolites as a hapten is possible, or the reaction may involve unusual metabolism of ethanol with accumulation of acetaldehyde and/or direct mast cell degranulation.