There is a hard flesh on the body commonly due to the following reasons: first, muscle scarring caused by local trauma or bump will lead to muscle hard lumps, which generally do not need to worry too much, can be localized hot compresses or use physical therapy instrument for physical therapy, the lumps can gradually subside. Second, lipoma, lipoma is caused by the abnormal convergence of fat, generally do not need oral medication or surgical removal, but when the mass is large, it needs to be removed under anesthesia and sent for pathological examination. Thirdly, sebaceous cyst infection, which is a disease caused by blockage of hair follicles, needs to be clarified by physical examination and local ultrasound in hospital. Fourthly, keloid tumor is caused by trauma, which usually fades with time.