About 9,000 people wind up in the emergency room every year for injuries related to fireworks. Most involve the hands, fingers, and arms. Burns are the most common. You can treat a minor burn smaller than your palm at home. Run cool water over it until the burning feeling stops. Cover it with a clean, dry cloth. Larger burns, and ones to the hands, feet, face, genitals, and major joints, usually mean you need to go to the ER.