I’ve got a open wound on my forehead from someone’s teeth hitting me. It has a scab now but it’s red and swollen and throbbing. What should I do?

You need antibiotics. The signs of infection are redness, heat, pain, swelling, and drainage. Hurry and get antibiotics for your forehead, especially because this is your face! You absolutely must protect your appearance to the rest of the world by fixing this now!