Zhao Hongyi, director of the Third Hospital of Beijing Medical University, replied: From the name, we can judge that the most basic difference between the incision and the external incision is the position of the incision. By internal incision, we mean that the incision is designed inside the nostril, and the incision and scar of the operation may not be visible outside. The external incision is on the outside of the alar, which is the junction of the alar and the cheek. If I make an incision in the nasal groove, then its trace is exposed, and the incision is. Another difference is that it solves different problems. We mainly solve a form of alar abduction by internal cutting, and change the shape and width of alar by cutting a part from the inside and then pulling it to the inside. Then, in addition to changing this point by excision, we can also change the shape of alar hypertrophy and excessive tissue expansion by excision of some tissues, so the degree of excision change should be greater, which is the main difference between the two.