Possible plot hole?

[coldmero.livejournal.com]

isuzuchan44 and I were talking about things like plotholes, and she brought up a nice one, however, she's too lazy to post.

So like, do scars disappear with memories?  C.C.'s boobscar is kind of nonexistent now.  In turn 16 and I'm sure there were other times, C.C. is shown stripping, and there's nothing there. 

So, is there any reason that any of you know of?

I'm totally sorry if this was posted before, but I'm pretty sure it wasn't.