RecruitingPhase 3Drug trialA Pilot Clinical Trial Comparing Topical Fluorouracil to Fluorouracil Plus Calcipotriene Field Treatments in Patients With Multiple Actinic KeratosesThe goal of this clinical research study is to compare the effects of topical fluorouracil alone to topical fluorouracil plus topical calcipotriene in patients with multiple actinic keratoses. "Topical" means the medication is applied directly to the skin.