Buttocks long a hard lump may be due to folliculitis, subcutaneous lipoma or mosquito bites and other formations, clinically there is no rapid elimination of one, it is recommended that the patient in the guidance of the doctor to clarify the specific causes of the disease through drugs, surgical treatment, etc. to eliminate. 1. Folliculitis: Folliculitis is usually formed due to bacterial infection, and can be treated with topical antibiotic drugs, such as fusidic acid ointment, mupirocin ointment and so on. 2. Subcutaneous lipoma: the formation of subcutaneous lipoma is generally related to the stimulation of inflammation and abnormal fat metabolism, etc. If the lesion is small and there is no obvious discomfort, it can be followed and observed, and can be treated by surgical excision if necessary. 3. Mosquito bites: the lesions formed by mosquito bites can be used externally with glucocorticoid drugs to anti-inflammatory desensitization, such as dinexed cream, hydrocortisone butyrate cream and so on. When the patient has a hard lump on the buttocks may also be other reasons, it is recommended to go to the regular hospital for examination in a timely manner, under the guidance of a professional doctor for standardized treatment. The above drugs need to be used in a standardized manner under the guidance of a doctor.