The ASPS list covers both methods: anesthesia risks, bleeding, hematoma, infection, asymmetry, numbness of the chin and lower lip from the mental nerve, poor healing, prolonged swelling, a result you are not happy with and the possibility of revision. Implants add displacement, capsular contracture (thick scar around the implant) and, over years, some erosion of the bone beneath. The review's numbers: implant infection ranged from 0% to 23.8% across studies and persistent sensory change was 9.4%; genioplasty infection was 0% to 5.3%, temporary numbness was very common, and numbness lasting beyond a year affected 7.4% to 12.5%. Both are permanent operations on the face; the surgeon's experience with the specific method is the main variable.