@nodensuke:
Maybe it's just my eyes being wonky..but..
What's up with that massive scar on Law's chest??http://25.media.tumblr.com/1f1a5a8bca6d18bdb4ab957302e71bb1/tumblr_mhkzub3CmH1rtpszvo2_400.png
During that whole scene Doflamingo is asking Law if he remembers what happened last time he pissed Vergo off and that it must still be traumatizing for him, and then…This panel.
I get that it could be his ability/some kind of weird...whatever putting his heart back in, but the way it's drawn makes it look like a Luffy-like scar.
I agree that you're probably looking too deep into this, but that panel is pretty awkward to begin with…
If I had to hazard a guess I'd say it's the shadow of him lifting up a shirt or something.
I remember pixiv artists getting confused about that panel too and making fun of it, somebody actually diagrammed out the shadow idea and it made sense to me at least.
Here's one:
!