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A 60‐year‐old man with metastatic renal cell carcinoma presented with a 6‐month history of a pruritic, exquisitely painful genital eruption appearing 3 months after initiation of nivolumab. Examination demonstrated a poorly defined, lichenified scrotal plaque studded with erosions, yellow crust, and tense vesicles. There was no other lesion on the body or mucosae. Histopathology revealed a subepidermal...