Best regards, even though your side photo of the face is of help we can not be 100 % sure about the real pathology in the circled area. My impression is that the most probable cause of the problem is hyperplasia/hypertrophia of the symphisis and body region of mandibula (lower jaw). There are other possible causes as well. Surgical correction should be planned according to the mentioned pathology.
Davor Dzepina, MD, PhD