Friend's boyfriend keeps flirting with me...what should I do?

First things first. If you have exams coming up you should cast him out of your mind and focus on the task ahead. If not you should conquer your shyness and talk to him and your friends about him, this may sound stupid but don't ask your friends for permission to ask him out or anything. Also don't worry about your skin grafts and scars if he really likes you he will put that aside and look at you truly.Finally living your life doesn't mean going off with boys, it's enjoying life.