Answer 1
There are fade creams like VitaK and Mederma.
Laser treatments, blue/pulse light treatments, and dermabrasion are also available.
There is that cover cream that only hides them but doesn't lighten them.
I have lightened the skin on my elbows and knees with lemons cut in half and rubbed on that rough skin.
Vitamin E oil and cocoa butter prevent stretch marks but do little to actually lighten the skin.

 How to prevents scars...
Simple solutions
* Clean with soap and water Wash the cut as soon as you can, then cover with an antibiotic cream like Neosporin ($7; at drugstores) and a bandage. Leave it alone for at least two days.
* Keep the wound moist To maximize the repair process, apply moisturizer twice a day for a week once the bandage is off. Mederma ($24; dermadoctor.com) contains aloe and a patented onion extract to hydrate and fight inflammation.
* Smooth with silicone If the area is still puffy after a month, try a treatment with silicone. Dermatix Ultra ($50; at doctors' offices) will help break down scar tissue and flatten skin.
EXPERT STRATEGY If, despite your at-home efforts, a scar still forms, a dermatologist can help. Cortisone shots instantly smooth bumpy skin. If you've had the scar for months (or years), a fractional laser like the Fraxel will help even out your skin's texture and tone. You'll need about four treatments, starting at around $1,000 apiece.
* The bottom line "The sooner you treat a wound--ideally within five days of getting cut--the less likely it is to scar," says Valerie Callender, M.D.