[Basal cell carcinoma arising in a seborrheic keratosis: a case report].

Seborrheic keratosis are one of the most common benign epidermic tumors in clinical practice. Malignant transformation is exceptional and occurs by the involvement of human papilloma virus. We report a case of seborrheic keratosis of the armpit in a 55 year-old woman whose biopsy revealed the presence of a basal cell carcinoma.