Let the hickey wear off and throw the guy out the slippery slope he dove in on...then go out and buy a mock turtle neck until that sucker moves on. Amazing what joys people get out of someone sucking on their neck...scares me. I think they're vampires in disguise as a dork. If they really must do this have them put it in a place no one can see and one they'll never opt for again...your armpit!