Actinic keratosis and squamous cell carcinoma.

Actinic keratosis is a common skin disorder in elderly patients with fair complexions. It is caused by exposure to ultraviolet light. If left untreated, actinic keratosis may progress to squamous cell carcinoma. The metastatic potential and prognosis vary with the type and location of the lesion. Several approaches to treatment are available, including local destruction, excisional surgery, Mohs surgery, cryosurgery and radiotherapy.