Looks like it got punched or wracked in when the previous owner ran into something. The backing blocks on the inside make it look like they're not going anywhere. Fixing it will entail grinding off all the cracked/compromised material and then a touch more beyond that so that the repair can be melded into the lines of the bow. Then you'll need some fiberglass tape (it's a small area; you don't need a whole lot) and epoxy to layer over the ground-off area until it fills back in what you ground off. You will need to sand everything smooth and even with the existing surfaces before applying gelcoat over it all, masking where you want the new material to stop. Matching the color is the hardest part. Since I'm colorblind I let other people do that for me. Then you sand (really fine) the new gelcoat down so you can't see where the new and old meet. Might take a weekend, what with letting the epoxy and gelcoat each kick overnight.