Photodynamic therapy (PDT) is a medical treatment that targets precancerous cells as well as certain types of cancer cells. The goal is to eradicate premalignant and early-stage cancer and reduce the tumor size in end-stage cancers. Conditions such as actinic keratosis are also treated with photodynamic therapy. More recently, it has been used for facial rejuvenation aimed at correcting wrinkles, skin discoloration, spider veins and as a treatment for inflammatory acne. The procedure is easily performed in a physician’s office or outpatient setting. It uses a photosensitizing drug that is activated by an applied light source. The result is an activated oxygen molecule that can destroy nearby cells.