To the Editor: Diazepam is a benzodiazepine prescribed worldwide. In respect to its posology and indications, the drug is generally well tolerated. Hypersensitivity manifestations are very rare and of mild severity (1). The causative role of the drug in one case of allergic interstitial nephritis has been previously described (2). We have recently seen a patient who experienced bullous vasculitis, fever, and neutrophilia after therapy with diazepam.