The wound does not bleed also has the risk of infection, but less than the risk of bleeding infection. The skin is divided into epidermis, dermis and subcutaneous tissue, because the epidermis is no blood vessels, so after the injury does not bleed, the dermis and subcutaneous tissue have blood vessels, after the injury will bleed, if there is no bleeding, only the injury is not to the dermis below the tissue, that is, the injury is relatively superficial, but the epidermis for external bacteria, or various pathogenic microbial infection is the first But the epidermis is the first barrier to external bacteria or various pathogenic microorganisms, with very good elasticity and protection, and the risk of infection will be greatly increased after this layer is damaged. Although there is no bleeding, but the first barrier function of the epidermis has been destroyed, there is also the risk of infection, only if there has been bleeding, there are some pathogenic microorganisms can directly into the blood, the risk of infection is higher, or into the blood infection of the disease is more direct. Whether it is a variety of injuries or animal bites, even if it is not bleeding, there is also a risk of infection, the same need for protection or preventive treatment to reduce the risk of infection.