The bruised arm should be eliminated in different ways depending on the cause of the bruised arm. If the bruise on the arm is caused by an external impact, only subcutaneous soft tissue damage can be reduced by applying local ice for 24 hours to reduce tissue exudation. 24 hours later, the use of drugs such as decongestion can effectively promote the dissipation of the bruise on the arm. Second, if the arm is bruised because the puncture point is pressed for too short a time due to needle puncture, causing subcutaneous bleeding. In this case, the bruise should be given local pressure for 15 minutes to ensure that after the bleeding stops, hot towels are used to apply hot compresses to promote the self-absorption of the bruise. Generally, the bruising can subside on its own after 2-3 days.