Funny enough, I have one as I'm typing this. The best thing to do is, as I was told, is to keep your foot above the area of your heart, so it can't swell so easy, and put ice
…on it, but make sure not to keep the ice on too long so it freezes your foot. If you mean a bruise not behind the nail, then it's nothing. Just don't slam your foot into a basketball like I did! (MORE)