There are a few things you can do to stop the bleeding. First, apply pressure to the wound with a clean cloth. If the bleeding is coming from an artery, it will be bright red and pulsing; if it is coming from a vein, it will be dark red and steady. If possible, elevate the injured body part so that it is above the level of the heart. This will help slow the flow of blood. You can also use a tourniquet to apply direct pressure to the artery and cut off blood flow to that area; however, this should only be done as a last resort as it may cause permanent damage. Finally, if you have any kind of antiseptic cream or spray, use it on the wound before applying pressure or a bandage.