Okay, I know this is a reeeaaally late reply but here it is:
You can do this with basic stuff. You need some eyeshadow or cream makeup (like for face painting) in the colors blue, red and yellow.
There you use to make the basic bruising, so you'll need to experiment with it a bit to get the result you want.
After that you just need some fake blood.
I like to use two kinds, one thicker and darker kind of blood that dries and looks like older more dried blood. Then some liquid blood to make it look fresh.
If you wanna make it more advanced you can create a foundation with liquid latex. Just dab it on your knuckles and let it dry then you rub carefully on your knuckles. This will cause the latex to break and will make it look like your skin is kind of peeled off.