In your case, if the scar is sunken, it must be an injury. There were too many tissue defects at that time. The best way is to cut off the whole scar and then sew it up. Because it is a surgical knife cut, it belongs to primary suture, and the scar will be smaller after operation. Then pressure dressing, if ideal, half a year after surgery scar will be very light, basically invisible. (I'm a plastic surgeon)