Fixed drug eruptions (FDEs) represent an uncommon subset of drug reactions where typically dusky red skin eruptions recur at the same site each time a drug is administered. Multifocal FDEs are defined by skin eruptions at more than one site. We describe a patient with metastatic melanoma who developed a multifocal FDE to paracetamol, tropisetron and ondansetron during chemoimmunotherapy with interleukin 2 (IL-2) and dacarbazine. This case is unique since to our knowledge there has been no previous report of such a drug reaction to tropisetron. Moreover, recurrences were induced by drugs which were chemically unrelated (i.e. tropisetron and paracetamol). We propose that this unusual skin reaction to multiple drugs was induced by IL-2 administered during immunochemotherapy for the metastatic melanoma.
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