In the early stage, most of the hard lumps are caused by hematoma, which can be treated by cold compresses and surgical incision and drainage. Most of the hard lumps in the later stage are caused by scar formation, which can be recovered through functional exercise, physical therapy and rehabilitation training. 1. Early stage of muscle strain: After muscle strain, local bleeding will form hematoma, which will form hard lumps, and ice can be used to cold compress to promote capillary contraction to reduce bleeding. After three days, you can use hot water bags and hot towels to accelerate blood circulation and promote the absorption of blood. If the hard lump is not absorbed for a long time, it can also be treated by surgical incision and drainage. 2. Late muscle strain: If the hematoma is well absorbed after muscle strain, there is still a hard lump, which may be caused by scarring of the strained muscle fibers, which can be enhanced by strengthening the muscle contraction function exercise, and actively carry out physical therapy and rehabilitation training to promote the hard lump to subside. If there is a hard lump after muscle strain, it is recommended that the patient go to the hospital for medical examination, to clarify the cause of the disease and receive regular treatment.