Can a severe bruise be dangerous?

My husband (44 yrs old) fell a few days ago. He has a terrible bruise starting at his waist, down his backside, covering the side of his thigh almost to his knee. He says the bruise doesn't hurt much, but his muscles are very stiff and sore. He's been taking ibuprofin for the pain. He doesn't bruise easily and doesn't have any other side effects from this injury (nausea, broken bone or sprain). I'd like him to go see his Dr. but he doesn't want to go "just for a bruise". Should I be concerned or can we safely wait for it to heal on it's own?