Cutaneous verrucous carcinoma.

Verrucous carcinoma is a rare, low-grade, well-differentiated squamous cell carcinoma most commonly seen on mucosa. It has been infrequently reported to occur on the skin, where it is a slow-growing and locally aggressive tumour. It is not uncommon for cutaneous verrucous carcinomas to be mistaken for the more frequent verruca vulgaris and treated accordingly. Three cases of cutaneous verrucous carcinoma are presented with the medical history and follow-up data. Surgery is the treatment of choice; these lesions may sustain a potentially anaplastic transformation after radiation therapy.