After bone grinding or osteotomy, new bone segments are usually formed. In the process of healing, some people may have local bone hyperplasia, because the personal physique is different, and the situation of hyperplasia will be different. When hyperplasia occurs, the symptom is that the local bone tissue is not smooth, but it basically does not affect the overall shape of the face. Of course, there is another situation. When some inexperienced doctors do mandibular plastic surgery, the method is rough, and the bone residue is not cleaned up after osteotomy, which leads to the bone residue growing back after suture and serious proliferation. So it is very important to choose regular hospitals and experienced doctors.