After the injection of water light needle need to pay attention to local care, daily protection, eat a light diet and so on. 1. Local care: local redness and swelling will occur after the treatment, ice compresses can be applied to the treatment area to alleviate the symptoms; the surface of the skin will be temporarily left pinholes after the treatment, avoid friction or scratching, keep clean, so as not to lead to infection; 1-2 days after the treatment, pay attention to keep the skin dry and clean, according to their own conditions, the use of medical-type restorative masks and skincare products. 2. Daily protection: after the injection of water light needle need to pay attention to sunscreen, avoid direct sunlight, go out can wear a mask, play umbrella, etc.; treatment may be temporary peeling phenomenon, avoid tearing off with your hands, wait for its natural shedding; one week after the treatment to avoid sports, sauna and other sweating and heat behavior, so as not to lead to infection. 3. Light diet: After the injection of hydrafacial injection, it is recommended to eat a light diet, avoid eating spicy, stimulating food, such as chili, pepper, etc., quit smoking and drinking. It is recommended that people who have the need for hydrazine injection, choose professional and regular medical institutions for injection, and follow the doctor’s instructions to do a good job of scientific care after treatment.