PHOTODYNAMIC THERAPY has recently been used to treat, as well as prevent actinic keratoses. Photodynamic therapy for actinic keratoses allows treatment of visible lesions and ones not fully developed yet, as these cells greatly uptake the Photodynamic therapy drug over the other cells. Photodynamic therapy can be used throughout the skin, or applied to specific areas or lesions. Patients recover very quickly after treatment and it is very effective, near 90% in clearing actinic keratoses, in addition to many cosmetic benefits.