Masses left behind by healed tissue after a fracture or by certain diseases such as bone tumors are called skeletal masses. The skeletal system, like other organs, can develop tumors from any tissue component or metastatic lesions from other organs. Tumors that invade the bone can occur in the bone cells, the hematopoietic component of the bone, the cartilage, and the fibrous or synovial component. Other tumors may arise from the muscles and nerves, blood vessels, and fatty tissue of the bone. Bone masses may not be felt at the beginning, but when they are larger, they may be swollen and painful to the touch. Measures to prevent bone mass: 1. Ionizing radiation (including radiotherapy) can cause bone tumor, mainly internal radiation, especially osteophilic radionuclide (such as radium) is the main factor to induce bone tumor. The workers who come into contact with radium are luminescent paint workers, chemical workers and patients who receive oral or intravenous radium drug treatment. Ionizing radiation pollution prevention measures are mainly nuclear enterprise plant site should be selected in a suitable area and testing, plant processes and equipment should be safe, wastewater waste gas by purification treatment, medical and scientific workers and staff of related industries should strengthen the awareness of prevention, take protective measures. 2.Natural and artificial ultraviolet rays can cause skin cancer, should reduce excessive exposure to ultraviolet rays or outdoor activities when moving wearing appropriate clothing, protective glasses, sunscreen, etc. 3. Nuclear radiation of radon in indoor environment pollution (construction and decoration materials, etc.) is also an important cancer-causing factor. Attention should be paid to the selection of building materials, and the room should be ventilated as much as possible, and an exhaust fan can be installed if necessary. 4, electromagnetic radiation from cell phones, computers, TV and microwave products, try to use wired phones more often, use computers at an arm’s length from the screen, don’t watch TV for too long, etc. 5, injury and bone tumor injury (including fracture, bleeding, scar, burn, etc.) may be related to bone tumor. For example, although the cause of giant cell tumor of bone is unknown, there are some cases with history of trauma before the onset. In addition, epidermoid cysts, xanthogranuloma, (also known as tendon sheath giant cell tumor or benign synovial tumor), hemangioblastoma, mucinous cyst, synovial tumor, pyogenic granuloma, and malignant melanoma among soft tissue tumors of the hands and feet are suspected to be related to local trauma. It is evident that injury prevention is also part of the prevention of skeletal masses.