Hydrafacial injection is a more popular medical cosmetic method in recent years, whereby cosmetic substances such as hyaluronic acid or whitening agents are injected into the skin through a hydrafacial gun to moisturize, whiten and lighten spots. Generally this kind of hyaluronic acid is small molecule or small and medium molecule hyaluronic acid, which can be injected into the skin directly through the multi-needle hydrographic gun, and it is a more popular and direct, effective beauty method. However, if you do not pay attention to the formal surgical operation and post-operative care, the following risks may arise: 1, pain: the pain of each person varies, usually in the injection requires local anesthesia; 2, bleeding spots and ecchymosis: a common complication of cosmetic injections, usually within three days can be absorbed by itself; 3, hyperpigmentation: newborn skin is sensitive to ultraviolet rays, it should be well protected from sunlight and moisturizing measures, it can be self-subsorbed; 4, rashes: may be related to the Single injection amount is too large, can also subside on its own; 5, allergic reactions; 6, infection: manifested by the appearance of facial redness, swelling, heat, pain, and even the spread of infectious diseases (syphilis, hepatitis. AIDS). Strict disinfection and proper operation during the operation, do not touch and knead with your hands after the operation, keep clean and well protected can reduce the chance of infection; 7, some patients with long-term injections of hydrafacial needles, there may be fragile and sensitive skin, skin redness and so on. Therefore, patients should go to regular institutions to receive treatment and pay attention to the injection interval.