... cause unexpected effects of repair aging skin, acne skin, skin patches, wrinkled skin, allergies and the sun burns the skin, what's more, which is ... could not bring any harm or uncomfortable to the skin. Functionimprove pigmentary pathological changes,such as freckle, sunburn,senile ... ,and PDT as the facial skin care expert ,it doesn’t cause any side effect. Large scope of treatment, for any age ...