If there is trauma to the lumbar area, then it may be a fracture of the lumbar spine, local soft tissue injury. If there is no obvious trauma, it may be a localized lipoma, or a tuberculosis or abscess or other lesion of the lumbar spine. You can go to the hospital in time to see a doctor, who will make a preliminary judgment with the physical examination. Routinely improve the lumbar spine X-ray, to understand whether there is obvious trauma fracture or bone destruction, if necessary, combined with magnetic resonance imaging. According to the situation of the examination, then do the corresponding treatment. If it is a local soft tissue injury swelling, you can spray some swelling and pain aerosol. If it is a localized local lipoma, it can be surgically removed. If it is a cold abscess of lumbar spinal tuberculosis, surgical drainage is usually required, while anti-infective drugs such as isoniazid and rifampin are given for treatment.