The best way to promote healing of a cut or wound and to prevent it from leaving a scar is to keep it covered with a band-aid. Place a bit of anti-biotic ointment on the cut or wound to help keep it moist and keep it covered with a bandage, gauze, or a band-aid. It used to be thought that a cut needs to breath to heal and therefore you should uncover it and keep it open once a scab is formed. This is no longer thought to be true. The skin actually heals better and faster when covered and keeping your wound covered also helps prevent bacteria from getting in and causing an infection. Think about how many times you've knocked a scab off that was healing nicely. This can cause even deeper scarring where you would only have had a minor mark; so be sure to keep it covered until the scab comes off if it's on a part of your body that you want to minimize scarring.
This is also a wonderful way to heal acne on your face if it was perhaps picked too much and now you have a bleeding spot on your face. I know you did it accidentally and didn't mean for that to happen. The same treatment I described above of covering with a bandaid and keeping moist will help heal your pimple quickly while minimizing any scarring. I understand that you may not want to walk around all day with a band-aid on your face, but overnight while you sleep is a fine time to use this method to help it heal. It will look so much better the next morning. Remember, it's best not to squeeze your pimples!
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