Dermatological toxicity is one of the most commonly reported immune-related adverse events in patients receiving checkpoint inhibitor immunotherapy. We report the gradual development of a widespread bullous pemphigoid-like reaction in a metastatic melanoma patient 8 months after commencing treatment with the programmed-death-1 (PD-1) inhibitor pembrolizumab, requiring prolonged corticosteroid therapy. This case highlights the potential for insidious and late development of severe cutaneous toxicity following PD-1 inhibitor therapy and suggests that even prolonged immunosuppression may not necessarily compromise the efficacy of PD-1 inhibition in advanced melanoma.
- bullous pemphigoid
- programmed death-1 inhibition