Oh good grief. It doesn't look like a surgery scar, it looks like a rash. Like maybe there was some tape there and she is allergic. I am allergic to tape/adhesives and I will get a rash like that. If that was a surgery scar she would have a reason to sue the Dr. Why do people jump to conclusions over the dumbest things??
Edit - After going thru the gallery pictures it is clear that the mark is a shadow. Funny how the mark moved from boob to boob and up to her chest depending on how she was standing and how the light hit the dress. In this pic it looks like a rash but in the others you can clearly see that it is simply a shadow. For Pete's sake.