The strange itching after photodynamic do may be caused by high temperature, inflammation, allergy and other factors of photodynamic itself. You can relieve the symptoms by applying ice, applying vitamin drugs, and taking antihistamine drugs orally. 1. High temperature of photodynamic itself: photosensitizers gather in the diseased tissues and are excited under specific wavelengths of light or laser irradiation, generating single-line oxygen or other free radicals, causing necrosis of the diseased tissues, which is called photodynamic therapy. Due to the high temperature of the photodynamic itself may lead to the photodynamic do after the strange itching, you can improve the symptoms through the way of ice packs. 2. Inflammation: when photodynamic therapy causes inflammation reaction will also appear itchy situation, you can improve the symptoms by applying vitamin drugs such as applying vitamin E milk. 3. Allergy: photodynamic allergy may be due to the operation after the skin becomes more sensitive, when subjected to strong sunlight or bacterial stimulation, etc., can cause photodynamic do itchy symptoms, you can follow the doctor’s instructions to take antihistamines, such as cetirizine hydrochloride tablets to alleviate the allergic symptoms. Photodynamic do after itchy and intolerable suggest that patients go to the hospital in time to find out the cause of the disease, under the guidance of the doctor for medication, do not self-medication.