A hematoma is a mass caused by blood flowing underneath the tissue after a localized capillary rupture or rupture of a large blood vessel. A hematoma is a lump that forms when blood flows underneath the tissue after a localized capillary rupture or a rupture of a large blood vessel. If the hematoma is relatively small, ice packs can be applied within 24 hours of the injury to reduce local tissue swelling. Hot packs can then be applied after 72 hours to promote absorption of the hematoma and reduce pain. For larger hematomas, surgical incision is required to remove the hematoma. It is recommended to go to the hospital for treatment of hematoma. If the hematoma is relatively small, there is no need to worry, the hematoma will be absorbed by itself. If there is a large hematoma, you should go to the hospital to find a doctor to deal with it.