Hands smashed a black blood blister is generally caused by subcutaneous bleeding, can be treated by cold compresses, hot compresses, medication (such as Panax ginseng tablets) and other ways. 1. Cold compress: smashed a black blood blister on the hand within 24 hours can be iced water or ice for local cold compresses, can promote vasoconstriction, reduce bleeding, but also relieve the symptoms of pain. 2. Hot compresses: 24 hours after the hand smashed a black blood blister can be hot compresses, can promote the absorption of exudate, conducive to the recovery of the condition. 3. medication: smashed a black blood blister on the hand can also be used under the guidance of a physician to activate blood circulation and remove blood stasis (to promote blood circulation, eliminate blood stasis) medication for treatment, commonly used drugs are Yunnan Baiyao, panax ginseng tablets and so on. Patients should be treated in a timely manner, strictly comply with the medical prescription medication.