A wound is a cut or break in the skin that allows blood and germs to enter the body. There are several types of wounds including contused wounds (bruises), lacerations (torn skin), incised wounds (clean cuts), punctured wounds, gunshot wounds, and graze wounds. Proper first aid treatment depends on the type of wound but generally involves controlling bleeding, cleaning the wound, applying a sterile dressing, and seeking medical help for serious wounds or signs of infection or shock.