Okay, I don't need to be locked up. But they didn't just lock me up somewhere. They locked me up with Rose and with Donna and with The Master and you and a whole host of new people who'd make great companions. It's like... too much coincidence, getting us all together, and I don't know what their intentions are. Do they need us for something?
It could be that. The TARDIS would be able to figure it out for sure. In any case, I don't think there's much you can do except wait for it to fade, like you would with a normal bruise. I'm sure someone like you can make scars seem attractive.