The first thing to do is to check whether there is any fracture of the phalanx when the thumb is caught in a car door and bruised and blackened. After the fracture is removed, it can be treated by cold compresses, physical therapy, medication, surgery and other methods. 1. Cold compress: after the thumb is caught by the car door, it should be cold compress as early as possible for about 48 hours to reduce the generation of bruises. After 48 hours after the injury, you can also use hot towels to apply hot compresses or soak your hands in hot water to promote blood circulation in your hands and speed up the receding of bruises. 2. Physical therapy: the thumb was blackened by the car door clip bruises 48 hours later, you can bake electricity, ultrasound and other physical therapy, can make the local blood circulation, promote the absorption of bruises. 3. medication: thumb by the car door clip bruises black, if the pain is serious, under the guidance of the doctor can be through the diclofenac sodium extended-release tablets, celecoxib capsules and other drugs to relieve the symptoms of pain. Topical safflower oil and other drugs to promote blood circulation in the affected area to speed up the absorption of bruises. 4. Surgery: If the thumb is blackened by the car door pinch bruise, local hematoma, nerve damage, dysfunction and other serious conditions, it is necessary to carry out surgical treatment, such as fracture osteotomy and reset surgery, nerve repair surgery. Thumb by the car door clip bruises black patients should go to the hospital in time, for examination to clarify the condition, and under the guidance of the doctor’s treatment.