Soak it in water with salt, or you can make a baking soda paste put it on until it dries then simply wipe it off. It will draw out the infection quickly and make healing alot speedier.
ACk I am sorry you have such a boo boo during the holidays. I would hate for that to happen to anyone at anytime but now is just plain bad. Hope you can heal pretty fast.
Oouch.... Thats one of the MANY reasons I'm no good with hand projects :( Quilting can be a dangerous occupation. lol I hope your finger heals quickly.