Immediately rinse under cool running water, use mild soap to clean the wound and then apply direct pressure for five minutes. “These types of cuts do tend to bleed a lot,” says Dr. Nicks. What helps? Keep your hand above your heart to decrease blood flow to the area. Apply antibacterial ointment and a bandage. If the cut is more of a "nick, treat it the same the way, though you probably don't need to keep you hand above your heart.
Go to the ER if: The bleeding doesn’t stop after 15 minutes of direct pressure, or if you’ve lost function in your hand or the wound keepings reopening.