Summarize:

This will keep the wound moist and prevent it from scarring. Make sure you’ve cleaned the wound first. Then, use clean gauze to apply the jelly or ointment. If the wound is 3 inches (7.6 cm) or smaller in diameter and not very deep, you can use a bandaid to cover it. Peel off the back of the bandaid and avoid touching the sticky side, which will be going on the skin. Stick the bandaid on so that the soft middle part is directly over the wound. If the wound is bigger than 3 inches (7.6 cm) in diameter, carefully place a large bandaid on top of it to keep it covered. You can also cut a piece of gauze so it covers the wound and a few inches around the wound. Place it on the wound and secure it with medical tape. Make sure the tape is secure but not too tight, so that it doesn’t cut off circulation.
Put a layer of petroleum jelly or antibiotic ointment on the wound. Use a small bandage for a small wound. Apply a large bandaid or gauze on a large wound.