How can I fix a small pinch point injury scar that keeps growing back under new skin. (Photo)

I'm 45 and have a small pinch point injury scar on my lower abdomen from a partial human bite that happened when I was 7 years old. No matter what skin peeling treatments and dermabrasion treatments I have tried, the original teeth marks which look like this "( )" always grow right back in the new skin, How do I treat this so that new skin grows back WITHOUT the teeth marks underneath my skin ?? I suspect their may be a problem with the basal layer/basement membrane ? Please help me fix this.