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Rhinoplasty can be divided into closed surgery and open surgery. In traditional open surgery, an L-shaped silicone prosthesis is placed in the bridge of the nose and nose. However, due to the limited size, it can not completely fit the nose shape, or because of the long-term friction between the implant and the nose, the tip of the nose in contact with the implant becomes thinner or even perforated. Professor Xu Jianwei said that the tip of the nose needs to be supported by solid supporting materials (autologous cartilage, medpor, etc.). ) so that the skin can cover the tip of the nose without tension. Injection rhinoplasty is only effective for plastic surgery of nasal dorsum collapse, and it should be used with caution for nasal tip. It has been reported that there are cases of needle tip necrosis caused by injection.