A hard lump after a muscle strain may be a hematoma after a muscle strain. Early stage is based on conservative treatment and rest, and ice can be used to apply cold compresses. In the later stage, it can be treated by surgical drainage, physical therapy and functional exercise. 1. Conservative treatment: after muscle strain, capillary rupture and bleeding at the site of the strain, the formation of hematoma in the local area will be touched by hard lumps, in the early stage of rest, braking-based, you can use ice for cold compresses in order to reduce bleeding, reduce swelling. After three days, you can choose hot water bag hot compress, in order to promote blood circulation, promote the absorption of accumulated blood. 2. Surgical drainage: If the blood accumulation is large and not absorbed for a long time, surgical incision and drainage can also be chosen for treatment. After the surgery, pay attention to timely dressing change and oral amoxicillin and other antibiotics to prevent infection. 3. Physical therapy and functional exercise: muscle strain muscle fibers in the healing process will form scars, but also the formation of hard knots, you can carry out physical therapy such as hot compresses and infrared and other physical therapy treatment. Also through the strengthening of the functional exercise, promote the functional recovery of muscle fibers, and promote the dissipation of hard knots. If there are hard knots after muscle strain, it is recommended that the patient go to the hospital to improve the examination, to clarify the cause of the disease, and receive regular treatment.