The majority of nodules appearing in the lower back are seen clinically as benign tumors on the body surface. The appearance of benign tumors on the body surface most commonly includes two main types, one is lipoma and the other is sebaceous cyst. The exact cause of these two conditions or two kinds of body surface swellings is not clear so far, as follows: 1. Lipoma: lipoma has smooth surface, good mobility and clear boundary. The exact cause of lipoma is not clear so far, and the only treatment means is complete excision under local anesthesia to obtain cure; 2. Sebaceous cyst: sebaceous cyst usually has black head on the epidermis, and if The cysts will appear when secondary bacterial infection occurs and require timely incision and drainage. For sebaceous cysts, there are no drugs to control their growth and shrinkage or disappear, and the only way to get a cure is to remove them completely through local anesthesia. The most common types of nodules in the lumbar region are subcutaneous lipomas or sebaceous cysts, both of which require surgical removal to cure.