Most of the cases are subcutaneous lipoma, but there may be lymph node enlargement, fibroma, subcutaneous cyst, subcutaneous hematoma, chest wall tuberculosis, etc. Generally, it is necessary to carry out ultrasound examination of the chest wall to determine the nature of the mass before further treatment. 1. Subcutaneous lipoma: most of them are small in diameter, with intact envelope, soft texture, clear boundary, and no obvious adhesion under the skin, and can be surgically removed. 2. Enlarged lymph nodes: subcutaneous lymph node enlargement in axillary rib cage is more common, which is often caused by inflammation and infection as well as lymph node metastasis of malignant tumor. 3. Fibroma: subcutaneous lumps at the rib cage of female breast are common, most of which are breast fibroma. 4. Subcutaneous cysts: caused by trauma or long-term friction, with soft texture, clear boundary and fluctuating sensation. 5. Subcutaneous hematoma: trauma to the ribs and other reasons can cause bleeding of subcutaneous blood vessels to form lumps, with fluctuating sensation and pressure pain. 6. Chest wall tuberculosis: chest wall tuberculosis is secondary to pulmonary or pleural tuberculosis infection of the ribs, sternum, chest wall soft tissue tuberculosis lesions, usually no obvious symptoms, can be manifested as a reddish abscess, pressure can have fluctuating sensation. There are lumps under the skin at the ribs, and it is recommended to go to the hospital for further physical and ultrasound examinations before further treatment.