OP, I know it sucks when you ding gear, and your friends kinda 4 letter D word, but I say leave the damage be! Strats look best with some relicing. That little burn mark makes your strat different from any one elses. Its like a scar or something from when you were a child It becomes part of you. At the end of the day, the guitar is just a tool for your musical inclinations. Tools that get used, get damaged and worn. Ya know? If you have your heart set on it though, I agree about putting some nailpolish on your guitar. OR another option is you can take it into an autobody shop and see if they can give you a little bit of matched paint to dab in there.