The leg is damaged to varying degrees by external violence to the leg muscles, fascia and other subcutaneous tissues. After the injury, blood and tissue fluids ooze out of the injury, if the injury is mild, these fluids will be absorbed by the body and the leg will return to its original appearance, but if the injury is heavy and the amount of fluid oozed out is too much, it will cause the body to have a part that cannot be absorbed and finally becomes a scar in the body, which feels like a hard lump when touched by hand. This situation should be promptly applied to invigorate blood stasis internal as well as external medication, with manual massage, appropriate leg activities, the use of magnetic therapy, heat therapy, ion introduction and other physical therapy, try to make the hard lumps absorbed and become soft, the longer the hard lumps appear, the treatment time will increase exponentially.