run into a wall or piece of furniture backwards or sideways.get hit on the butt too forcefully with someone’s hand or with another object.This type of usually minor injury happens when an object or another person makes forceful contact with the surface of your skin and injures muscle, tiny blood vessels called capillaries, and other connective tissues below the skin.īruises are especially common if you play any kind of sports that can (literally) knock you on your butt, such as: Bruises, also called contusions, on the butt aren’t that uncommon.
