Hypersensitivity reaction.
D000707:Anaphylaxis / Q000209:etiology; D006632:Histamine / Q000494:pharmacology; D006636:Histamine Release; D006801:Humans; D006967:Hypersensitivity; D006968:Hypersensitivity, Delayed; D007705:Kinins / Q000494:pharmacology; D012701:Serotonin / Q000494:pharmacology
D007705:Kinins; D012701:Serotonin; D006632:Histamine