Patients appear shoulder acromion small bone protrusion, generally may be normal bony protrusion, may also be due to acromioclavicular joint lesions at the acromion, bone tumors and other factors. 1. Normal bony prominence: If the patient is thin, the bony prominence can be clearly seen on the body surface or at the time of shrugging, such as the end of the acromion of the clavicle and the acromion, etc. At this time, no special treatment is needed. At this time, there is no need for special treatment, it is a normal phenomenon. 2. Acromioclavicular joint lesion: if there is acromioclavicular joint dislocation, bursitis and other acromioclavicular joint lesions, a bony mass can be formed at the acromion, often accompanied by pain symptoms, this situation is abnormal, and need to consult the doctor in time for treatment. 3. Bone tumor: acromioclavicular bone tumor can also cause patients to appear affected area protruding, should go to the hospital as soon as possible, after a clear diagnosis for treatment. There are a lot of reasons that cause the small bones at the acromion on the shoulder to protrude, patients should go to the hospital in time to find out the reason, so as not to delay the condition.