Contusions and contusions are still very different, contusions are only the superficial layer of the skin is damaged, the wound is usually attached with mud and sand, it is caused by the friction between the skin and the ground after the wound. Contusion wounds are large and shallow, while contusion wounds are large and deep, and contusion wounds are deeper, and the wounds are not only damaged on the surface of the skin, but also torn in the deeper layers of the skin. There is also a difference between the two in the treatment of wounds. When dealing with contusions, it is only necessary to clean the wound with iodophor or alcohol to remove the sediment attached to the wound. When dealing with contusions and lacerations, in addition to the need to use iodophor and alcohol to simply treat the wound, because of the occurrence of tears, it is also necessary to perform wound closure.