Hyaluronic acid, also known as hyaluronic acid, is a natural filler that can be used to fill in the cheeks. It not only has the function of maintaining the elasticity of the skin, but also locks a large number of water molecules, which has a moisturizing and lubricating effect on the tissues, making the skin full, young and elastic. However, hyaluronic acid cheek augmentation also has some disadvantages and risks, as follows: 1, redness, swelling, itching: after the procedure of hyaluronic acid injection, the patient is very likely to have temporary swelling, redness and itching, generally speaking, most of the patients can be relieved after one week. For patients with fragile blood vessels or sensitive skin, bruising is likely to occur after the injection, although it usually does not last long. In addition, after injecting hyaluronic acid, the skin may have a particle-like touching feeling, most patients can disappear automatically after one week; 2, excessive injection: when encountering this phenomenon, patients need to go to the hospital in a timely manner, and serious need to take out the injected material or dissolve it by injection of dissolving enzyme, which is very difficult to deal with, so it is necessary to communicate with the doctor before the surgery; 3, pigmentation: if the injection is too shallow or there is no sunscreen, it will not be easy for the patient to get rid of it. injection is too shallow or no attention is paid to sun protection, patients are likely to have hyperpigmentation, which needs to be alleviated by using whitening mask 4-6 times a month; 4, embolism: leading to local skin necrosis and loss of vision, cerebral infarction, and even life-threatening.