First, go smack the LFS employees in the head for feeding the angler "fish crack" (FD krill)...[/rant]
It's hard to tell from the photo. The fish could have been injured during capture, or by a tankmate at the LFS, or it could be an infection. You could keep a close watch on them and see if they appear to be healing (you mentioned that they seem like they may be doing so) or whether they appear to be worsening/spreading (check for redness especially). If they seem to be spreading, you could administer a course of Furan 2, as this is a good, broad spectrum antibiotic.