Do NOT, for any reason, say 'No, it won't." and do it again. Because, when it does leave a mark (and allow that a woman might just know her skin better than you) she's not going to be thinking kind thoughts about you every time she sees it. And she might just have something ... hard to say to you next time she sees you.
Going on four days with this ugly yellow bruise.... (Just a note: I don't think this person even has an LJ)