The thigh meat side long bag, common in the following reasons: 1, sebaceous cysts, this is due to the follicle obstruction caused by the disease, need to go to the hospital to check the local ultrasound to be clear, the disease can only be cured by surgery. 2, lipoma, this is due to the accumulation of fat caused by the excessive, generally do not need to worry about it too much, regular follow-up can be. Because it is a benign tumor, so the growth is slow, but if there is obvious pain or rapid increase, it is necessary to improve the examination, surgical resection treatment, and then sent to pathological biopsy. 3, fibroma, this is a kind of fibrous connective tissue benign lesions, generally do not need to worry too much about it, regular follow-up can be. 4, enlarged lymph nodes, this may be due to the bacterial or viral infections caused by the oral administration of some heat and analgesic drugs to solve the problem. This may be caused by bacterial or viral infections, which can be solved by oral administration of some heat-clearing and analgesic drugs. There are other possibilities, such as being bitten by mosquitoes, or caused by foreign objects.