Precautions after hydrafacial injection include keeping the injection site dry, diet, moisturizing, sun protection and so on. 1. Keep the injection site dry: after the injection of hydrafacial injection, the eye of the needle in the evening or the next day to close naturally, this period of time the injection site should be avoided to get wet, to keep the injection site dry, so as not to cause infection. 2. Diet: After the injection of hydrafacial injection, redness and swelling will appear within 3 days, during which the diet should be light, prohibit smoking, alcohol and spicy stimulating food, so as not to aggravate the symptoms. 3. Moisturizing: After the injection of hydrafacial injection should pay attention to moisturizing, the use of medical repair mask and repair liquid, can achieve better whitening and moisturizing effect. 4. Sunscreen: After the injection of hydrafacial injection must pay attention to sunscreen, avoid strong sunlight, go out can play umbrella, wear sun hat, etc., to avoid sunburns lead to local phenomenon of hyperpigmentation. After the water light injection may appear local infection, hyperpigmentation, skin sensitivity, facial stiffness and other side effects, it is recommended to go to a regular hospital, operated by a professional doctor to reduce the chances of side effects.