What is the meaning of Bree's scar?

Jessica mentioned in Mixed Media that they needed a one piece swim suit that would still show the scar in the "Swimming" video. There have been discussions that the scar may actually be a watcher symbol.

http://www.lonelygirl15.com/forum/viewtopic.php?t=310&postdays=0&postorder=asc&start=45



From mixed media interview…
Jessica: “Obviously Bree was reserved and her parents wouldnt let her wear a bikini and that stage so I thought “awesome I’m going to find THE most conservative one piece swimsuit I can” but then (to Miles and Greg) you said “you need it to be low so that they can see the scar on your back”"



Swimming episode on YouTube

Swimming episode on Revver

(there may be minor differences between these two episodes)