Nivolumab-induced lichen planus pemphigoides.

: Programmed cell death 1 (PD-1) receptor inhibitors, such as nivolumab, are used in the treatment of non-small cell lung cancers, melanoma, and other cancers. Cutaneous adverse events (AEs) associated with anti-PD-1 therapy have been widely documented. Although cutaneous AEs often are mild, some patients can develop notable morbidity. We report an 87-year-old woman with stage IV non-small cell lung cancer who developed a bullous eruption on the trunk and extremities. Biopsy of the lesions revealed a subepidermal bullous lichenoid eruption with positive immunofluorescence in a linear pattern at the basement membrane zone, consistent with lichen planus pemphigoides (LPP). The patient improved with oral prednisone and cessation of nivolumab therapy.