While black coffee may be considered by most to be a necessary part of every morning, those people may not know that black coffee can also be a great way to eliminate a bruise from the skin. Take the used coffee grounds and apply them in a thin layer over the sight of the bruise. You should then apply a bandage over the coffee grounds, holding them in place. The concentrated compounds in the coffee will help to reduce inflammation and pain, and when you remove the bandage a day or two later, the bruise may be gone entirely!