The lumps on the scalp mainly include scalp hematoma or inflammatory masses and other causes, and the details are as follows: 1, scalp hematoma: caused after trauma, because the periphery of the scalp is capillary tendon membrane, under the scalp is loose connective tissue, and the blood supply is rich, if inadvertent trauma, it may form a scalp hematoma, and most of them can be cured by using pressure bandages; 2, inflammatory masses: including lipoma and sebaceous gland cysts. The exact cause of either lipoma or sebaceous cyst is not clear so far. For lipoma or sebaceous cyst on the scalp, there is no drug that can control its growth, shrink or disappear, and the only way to cure it is to remove it completely through local anesthesia surgery, especially for sebaceous cyst, which may cause secondary bacterial infection or even septicemia.