I was advised by a doctor 6 years ago to have fat grafting done to my pre jowl sulcus area instead of fillers. The doctor placed the fat behind the pre jowl into the jowls. Since then I’ve had accutite, lipo & kybella & nothing has helped. The areas on each side are only about an inch in length & an inch in width. I understand the marginal mandibular nerve is in this area. But I'm wondering why nothing so far has worked?