Another option is to cut a flap, clean out any loose debris, pour in lam resin, flap it back down, weight it down so all the excess resin squeezes out, wipe clean, let it kick, sand and patch the flap line, hotcoat, sand. I never fill in the dent... not worth the effort/weight/bulk.
I've done this and it works pretty well. Easier than cutting the whole piece out. Depends on how much you love this board. If it's your "go to" than cut it all out and re-glass. If you don't do anything, the delam will grow, and the board will weaken, maybe, even break.