Most of the subcutaneous bruises will be gradually absorbed and disappear within a week, but if they do not disappear for a long time, two consequences may occur. One is because blood is a good culture medium for bacteria, long time subcutaneous bruising, it is very easy to cause bacterial breeding infection, subcutaneous bruising infection, formation of abscess, need timely surgical treatment; the other is because the amount of bruising is relatively large, long time can not be absorbed, blood began to radicalize, in the subcutaneous formation of relatively hard radicalized tissue, with time, slowly absorbed and shrink. These are the two more common consequences. If a hematoma is found within a week without significant absorption and reduction, it is recommended to try to go to the hospital for puncture and drainage, or hematoma incision and drainage, most of which can heal quickly with pressure bandaging after drainage to avoid causing hematoma infection.