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Management of hereditary angioedema should include fresh frozen plasma containing C1 inhibitor (C1-INH), whenever possible; if C1-INH-containing plasma is unavailable, fresh frozen plasma can be used instead. Do not give neomycin to patients with suspected cellulitis; the drug may promote antibiotic resistance in Staphylococcus aureus, a pathogen often associated with this condition. Whenever a patient presents with erythematous skin lesions and a recent history of receiving penicillin or a cephalosporin antibiotic, a sulfa derivative, or an anticonvulsant, the suspected medication should be stopped until Stevens-Johnson syndrome is ruled out.