When your hand is caught in a car door, it usually takes about 2 to 4 weeks for the bruising in the nail to fade away. However, the exact amount of time it takes to go away depends on the size of the pinched finger. If the bruise is not serious, it can be eliminated in about 2 weeks without medication. It is recommended that within 48 hours after being pinched, local cold compresses should be applied in a timely manner, and the pinched finger should be elevated, and after 48 hours, hot compresses can be applied to promote local blood circulation and the elimination of blood stasis. If the finger is pinched more seriously, the bruise may take about 4 weeks to eliminate, you can go to the hospital, and then actively cooperate with the doctor for appropriate treatment.