Cases of cutaneous neoplasms occurring on prior sites of trauma and scars are common. Vaccination scars are common sites of this phenomenon. We report a case of superficial basal cell carcinoma (BCC) occurring on a prior bacille Calmette-Guérin (BCG) site in a 59-year-old man. Any modification on a prior vaccination scar should prompt a skin biopsy to be performed to rule out a cutaneous malignancy.
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