If it's been more than 5 years since your last tetnus shot, you really need to get one. Make sure you wash the area with antibacterial soap. Rinse well, Soak in peroxide to bubble out any debri. Coat wih a gook antibacterialy ointment. Clean every day. Watch for signs of redness, swelling, warmth, and pain. If red streaks appear go to your doctor or ER immediately. The streaks are a sing of a bad infection.