I agree w/ kelly_aus that cis men's gynecomastia scars look virtually identical to our gynecomastia scars. I know copping to man boobs can be kind of embarrassing, but it's not medically inaccurate, and it would give your GP all the information they need to know, assuming you're going in for something sex non-specific like, say, asthma.
I like the battle scars thing, myself. I haven't had top surgery yet, but when I imagine the DI healing process, I really do see the scars, etc, as war wounds. My dad has all kinds of gnarly scars from a rock climbing accident and I've always thought they looked cool. DI scars are visually similar and I guess they sort of occupy the same place in my brain, because I'm always like "Aw man, that dude is TOUGH" whenever I see trans guys' chests.