A raised bag near the back of the waist may be a scar, infection, chronic strain of the lumbar muscles, tumor, etc. Treatment depends on the specific cause. The treatment depends on the specific cause, scarring is prevention, infection usually requires sensitive antibiotics, and in severe cases, surgical drainage. Chronic strain on the lumbar muscles requires braking and physical therapy to promote local blood circulation, while tumors need to be treated by surgical excision.1. Scar: scarred individuals are prone to form keloids after incision and trauma surgery on the back of the waist, which are caused by abnormal proliferation of connective tissue, resulting in a raised bag near the back of the waist. The main focus of keloid is prevention, such as avoiding incision infection by operating as aseptically as possible and paying attention to medication changes. For keloid patients, surgery should be minimally invasive to minimize the incision, and fibroblast inhibiting drugs such as trinostat can also be applied to reduce scarring. Those who have formed scar can be given laser irradiation, freezing treatment, and if the scar is large, surgical implantation can be performed; 2. Infection: commonly canker sores, due to multiple adjacent hair follicles infection, pus aggregation thus manifesting as a lumbar mass, appearing as a raised bag near the back waist, with fluctuating sensation when touched, generally accompanied by redness, swelling, increased skin temperature, and in severe cases, oozing, general weakness and other manifestations. In the early stage, external antibiotics can be given, and if an abscess cavity is formed, it should be incised and drained as soon as possible, and sensitive antibiotics should be given at the same time. When lumbar tuberculosis forms a cold abscess, it also manifests as a lumbar lump, which is usually treated with standardized anti-tuberculosis treatment, such as isoniazid and rifampin, etc. When the abscess is large, it needs to be incised and drained; 3. Chronic strain on the lumbar muscles: such as recurrent episodes of lumbar back fasciitis causing contracture of the lumbar back muscles, followed by the formation of a lump and the manifestation of a raised lump, cold or lumbar spine lesions can stimulate spasm of the lumbar muscles. Treatment is mainly to limit lumbar activities, give hot towel hot compress, artificial oil massage and other measures to promote local blood circulation; 4, tumor: including posterior lumbar soft tissue tumor and bone tumor. The common ones are subcutaneous lipoma and fibroma, which are manifested as masses with tough texture and can be pushed. Treatment is based on surgical excision, which generally takes local anesthesia to completely remove tumor tissue and adjacent normal tissues to avoid recurrence. For bone tumors in the spine and lower ribs, if the tumor is large in the late stage, it may manifest as a lump in the back, such as giant cell tumor of rib bone and spinal metastasis, etc. It is usually accompanied by stubborn pain in the back, hard to touch and cannot be pushed, so it is recommended to take surgery for radical resection. In conclusion, there are many reasons for the appearance of masses near the back and waist, and the prevention and treatment methods vary greatly from one cause to another. Therefore, it is recommended that patients should seek medical attention in a timely manner and standardize treatment under the guidance of a doctor, rather than blindly using medication.