Rhinoplasty by injection is to fill the nose with autologous fat or allogeneic material to achieve an augmented nasal appearance. Most of the allogeneic materials commonly used in clinical practice are hyaluronic acid, and collagen is also available. The use of hyaluronic acid for rhinoplasty is suitable for some candidates with moderate nasal tip height, but relatively low nasal dorsum. If you choose an irregular and unqualified institution to perform the surgery, the following hazards may occur: 1) infection, the regular product is relatively safe, if the product is injected from unknown sources, it may lead to infection and other adverse reactions, and in serious cases, it may lead to tissue necrosis, etc. 2, the injection method is incorrect, such as injection is too shallow, the patient has the possibility of skin fistula, serious skin necrosis, local ulcers, and even perennial. If injected into the ophthalmic artery, it will lead to blindness or skin necrosis on the back of the nose; 3, it is difficult to repair after injecting unknown injections, if the unknown injections are injected and need to be removed due to infection and poor shape, it is more difficult to remove and cannot be completely removed cleanly, which makes the subsequent nose repair surgery difficult and cannot be restored to the state before injection. Rhinoplasty requires injection and shaping at the same time, which requires strict control of the injection level and the amount of injection, thus requiring very high technical and aesthetic requirements of the surgeon. When a candidate needs rhinoplasty, please try to choose a regular medical institution and a professional doctor to ensure the safety and effect of injection.