After the dog bite, the local skin, or subcutaneous soft tissue bruising, is a normal performance. Because after the bite, in addition to local skin damage, and there will be local soft tissue contusion, contusion will generally lead to subcutaneous capillaries more or less rupture bleeding, may not appear at the time of bruising, but a day or two after the local bruising will slowly appear, oozing out of the skin’s surface, and to see there is a localized bruising or bruising. But if the dog bite wound, must immediately go to the epidemic prevention department or hospital to inject rabies vaccine, in order to prevent the onset of rabies, localized bruising can be backward over time, but also can be gradually absorbed.