Puckering above scar on face (photo)

I have a scar ony face that is 2.5 years old.  It is due to trauma where I received a facial laceration amd required stitches.  Suprisingly the scar doesnt vother me as much as the puckering above the scar that looks like a bump.  I have asked my dermatologist as well as a plastic surgeon about it and there response is, is that its so small that i shouldnt worry about it.  It does however bother me, i would love to find a solution that would flatten it out.  What is causing it? Is there excess tissue or fluid that can be removed ?  Ive tried rolling and massaging and nothing works, if anyone could provide a solution I would be forever grateful.   Thank you