If the bones are bumped after the symptoms of a bump, you should consider the following reasons: First, the most common reason, not the bones are bumped, but the soft tissue above the bone is bumped or swollen, hyperplasia, after the bump, muscle, tendon, ligament, tendon sheath and other structures will be damaged, the injury will lead to local exudation, swelling, longer time will appear swelling hardened symptoms or local formation of scarring,. The result is a bulge in the area that was hit. Secondly, the deformity of the bump may be caused by a local fracture after the collision, which will mostly result in limited limb movement or complete inability to move, requiring more professional and systematic treatment. Third, the local bump caused by osteophytes, the periosteum is hit will stimulate bone cell generation, resulting in the bump local gradually become convex, regardless of the cause, should go to the regular hospital to check the X-ray film, basically can determine the nature of the bump.