It seems most people here want to keep their bruises but I recently got one that was about 4"x8" from giving blood. This has never happened before or since. A nurse told me to just put a hot washcloth on it twice a day. The heat increase blood flow and breaks up the blood that is stuck there under the skin. It should start getting smaller within a few days.
Hope this helps anyone that needs it.
Hope this helps anyone that needs it.