There are many reasons for a long protruding bag on the clavicle, the common ones are as follows: first of all, it may be that the clavicle has a history of trauma, the clavicle has been impacted, leaving a compensatory protrusion on the clavicle, which is simply a protrusion, not combined with other symptoms, a mechanism of self-protection of the body. It may also be caused by enlarged lymph nodes. If this is the cause, it is usually accompanied by local pain and the pain is aggravated by pressure on the protruding mass, which has a soft texture when pressed. It may also be caused by a sarcoma. If this is the cause, the protruding mass usually becomes progressively larger over time and must be surgically removed as soon as possible to avoid damage to the surrounding nerves and blood vessels from the oversized sarcoma.