Leishmania scar: a risk factor for the development of basal cell carcinomas.

Basal cell carcinoma is a malignant epithelial neoplasm of skin that usually arises in areas of chronic sun exposure. It rarely originates from smallpox vaccination scars, chickenpox scars, previous surgical scars, or burn scars. We present a case of basal cell carcinoma arising on a leishmania scar on the nasal dorsum 30 years after the primary lesion.