A Rare Case of Bullous Pemphigoid Secondary to Checkpoint Inhibitor Immunotherapy: A Tense Situation.

Bullous pemphigoid is a serious and rare complication of immunotherapy. Here, we present a case of bullous pemphigoid secondary to ipilimumab/nivolumab checkpoint inhibitor therapy in a patient with metastatic melanoma. Immune checkpoint inhibitor therapy is more widely used now to treat cancer patients, bringing more challenging cases of adverse events associated with their use. Bullous pemphigoid can be a difficult diagnosis to make in the initial stages as the rash is similar to other red rashes before transforming into the typical appearance of a blister. As bullous pemphigoid can be a life-threatening adverse event, early identification is key to increasing patient survival.