It possibly could help.
Depending on location and size, a scar revision surgery could potentially help flatten out your indentation. The trade off is that you would have another scar there. Only you can be the judge if a regular scar is better appearing than an indented scar. Also depending on the location on your face, that can affect the final outcome.
Other options for indented scars include using fillers to give them volume.
I'd be happy to check it out, if...