Bruising around the hip and the swelling that goes along with the bruising can sometimes cause pain in the leg. The hip and pelvis area have a lot of nerves and nerve plexuses that form larger nerves in the hip and buttocks area. The sciatic nerve is an important nerve in this area. Swelling in this area can cause compression of both nerves and veins of the leg and radiating pain that may affect the whole leg. With these types of symptoms, it is always a good idea to have the cause of the pain investigated by your physician.