Efficacy and Safety of Cryotherapy Versus 5-Fluorouracil in the Treatment of Actinic Keratosis

Extremely cold liquid (liquid nitrogen) will used by a dermatologist to freeze and destroy abnormal cells in the treatment areas randomized to this treatment.

Patients will apply 5% 5-Fluorouracil cream in a thin layer twice daily for 4 weeks on the treatment areas randomized to this treatment.