Generalized bullous fixed drug eruption (GBFDE) is a specific variant of fixed drug eruption that belongs to severe cutaneous adverse reactions (SCARs) and its diagnosis is based mainly on clinical course and especially on the reoccurrence of typical bullous lesions in previous and new sites after re-administration of the offending drug. We present a well-documented case of fluconazole-induced GBFDE, with a positive patch test to fluconazole (30% weight/volume preparation) and clinical tolerance to itraconazole proven by negative oral provocation. Even in SCARs, patch testing represents a useful diagnostic tool, while oral provocation remains the gold standard in cases that an alternative but the chemically relevant drug must be administered.
Keywords: Cross reactions; Drug-related side effects and adverse reactions; Fluconazole; Patch tests.