Photodynamic therapy is useful for patients with early stage skin cancer. Photodynamic therapy is a method to treat tumor by using photosensitive drug and corresponding wavelength laser. Tumor cells can selectively absorb photosensitive drugs, and photodynamic reaction occurs after irradiation by red light of specific wavelength, which produces active oxygen and kills tumor cells, while surrounding normal tissue cells are not affected in any way. At present, it is mainly used for the radical treatment of precancerous lesions and early cancers. After receiving photodynamic therapy, patients may experience skin swelling and pain, edema, which can generally subside naturally. Patients should pay attention to keeping the skin clean and dry, wearing loose clothing and avoiding prolonged exposure to sunlight. If skin cancer patients need photodynamic therapy, they should go to the hospital for diagnosis and treatment in time, and the doctor should give specific treatment plan to avoid delaying their condition.