The demand for nonablative laser and light technologies has been increasing within the field of derma-tology as patients seek treatment for a multitude of skin conditions that offer minimal downtime andreduced adverse effects.Investigators continuously are studying these energy systems to determinetheir efficacy and define their optimal parameters of use for treating a variety of cutaneous disorders.This review article covers 2 widely used light technologies (photodynamic therapy and intense pulsedlight) and their application in the treatment of medical and cosmetic skin conditions such as cutaneousneoplasms,acne,chronic photodamage,and unwanted hair.Radiofrequency and infrared light,2 newerenergy sources that show promise in photorejuvenation,also are discussed.