Bring on the Cold
You can decrease the size of the bruise with quick action and something cold. Grab an ice pack or wrap a handful of ice cubes in a towel or put some ice in a plastic bag and place it against the bruise. Cold reduces blood flow, which limits growth of the bruise. You've probably seen or heard about the use of a big, cold steak to bring down swelling. There’s nothing magical about putting meat on an injury, however – the practice probably began when frozen meats were the only cold objects handy. But avoid the beef on your next bruise: putting a steak on an injury can actually be dangerous. Bacteria within meat have the potential to cause infection.