Hyaluronic acid introduction is the use of ultrasonic micro-fine mechanical vibration effect to regulate cell membrane permeability and help hyaluronic acid introduction, coupled with the heat effect, which can accelerate the absorption of the skin under the epidermis. At the same time, the mechanical massage effect strengthens the blood circulation and metabolic function, which can improve various problems such as skin discoloration, chloasma and skin sensitivity caused by dehydration. However, if the operation is improper, it may bring the following risks: 1. After the introduction of hyaluronic acid, the patient’s local skin may produce temporary slight redness, swelling and itching, which can usually be relieved after a week; 2. Patients may have allergic reactions, and it is recommended to do skin sensitivity test before the operation; 3. Local acute infection, local skin damage or infection, leading to the aggravation of infection; 4. Uneven skin; 5. Abnormal skin sensation. 6.The effect of hyaluronic acid introduction is not lasting, usually lasting for about 1 month, and requires several sessions of treatment to achieve the desired effect. Generally, 3-6 times is a course of treatment, with an interval of about 1 month each time, and each treatment takes about 30 minutes. Therefore, in order to avoid the above-mentioned risks, patients should communicate carefully with the doctor before surgery to understand the specific process of hyaluronic acid introduction, related risks, preoperative design, etc. and be psychologically prepared. At the same time, improve the examination to confirm that there is no allergy to hyaluronic acid. In addition, do not expose yourself to the sun for one month before treatment, and prohibit smoking, alcohol and spicy stimulating food after treatment to avoid other complications.