Hot compresses can promote blood circulation in the wound, relieve the hardening of hematoma and accelerate the disappearance of the lump. Hematoma is mainly due to external impact, collision, smashing, etc., resulting in blood vessel rupture, causing blood stasis, and gradually form a lump, when the hematoma hardens, the blood gradually coagulate, thus forming a hard lump, usually after hot compresses and massages, the hard lumps will gradually disappear, so the hematoma can be hard hot compresses, is conducive to the subsidence of hematomas, to avoid the buildup of hematomas. Hematoma, may be accompanied by anemia, headache, dizziness and other symptoms, if there is obvious discomfort, it is recommended to go to the hospital in a timely manner to avoid endangering the health of the body, if the hematoma for a long time is not absorbed, need to carry out hematoma incision drainage, to avoid the accumulation of long time, triggering inflammation.