If you've dinged your face, hands, or other body areas pretty bad and fear you'll develop a scar you'll be explaining forever, grab a hydrocolloid bandage at the store. One Lifehacker reader testifies it has prevented a bad lip scar from forming.
Reader AlexJAnder tells the tale of how a hydrocolloid dressing, or hydrocolloidal bandage, act as a kind of artificial scab, allowing your body to focus on healing and possibly avoid scabbing and, later, scarring. How-to go-to site eHow explains how to apply them, and notes that they're often found through their trade names: RepliCare, Tegasorb and Duoderm, among others.
Of course, if you've got a serious wound that continues bleeding and hurts pretty bad, get medical help. Otherwise, consider upgrading from your standard bandage to hydrocolloids:
The better solution is to keep it covered with a hydrocolloidal bandage (found in the band-aid section of your pharmacy). I don't fully understand the science/magic behind them, but the gist is that they act as a scab, so that your wound is allowed to heal fully.
At first it seemed counter-intuitive to keep a wound open, but after a week it's almost healed up with no signs of scarring.
Got your own scar prevention tips?