Well, in mandibular angle plastic surgery, if you grind the bone, it won't rebound. Liposuction may change back to its original state after a long time, which is mainly caused by your chewing habits. It depends on what your mandibular angle is like. Under normal circumstances, it will not rebound. I know there is a plastic surgery hospital in Korea/this is their Chinese website. It is natural that there is no scar on the mandibular angle.