For large cuts, deep lacerations or puncture wounds, rinse the area immediately under cool water to remove dirt and debris.
While the wound is new, avoid using hydrogen peroxide or iodine because these can cause irritation. Instead, clean it with an alkaline soap like Perla or Ivory.
In case of continuous bleeding, use a clean cloth to apply pressure on the wounded area while keeping it elevated. When bleeding has stopped, cover the wounded area with cling wrap to protect it from dirt.
Large and deep wounds require more care and immediate medical attention, so you should bring the injured person to the emergency room right away.