It will go away in less than a couple of weeks. Don't expose them to the sun!To give you guys a sense of the bruising I got (though to be fair, I also did fairly stupid things like run through an airport terminal with a heavy backpack trying to make my flight and wearing a belt [however small] when they advised me not to, not to mention going to a bunch of clubs in Berlin) - here are some pics of my torso. YMMV. Probably best to do this when it's not the summer time.
https://dl.dropboxusercontent.com/u/56454/Kerastem/stomach-front.jpg
https://dl.dropboxusercontent.com/u/56454/Kerastem/stomach-side.jpg
Strange thing, I had only one of the size of a coin.