If the scar is brand new you can use a topical medication like scar zone or mederma. Theses medicines will not make the scar disappear but they will make them less noticiable.

Although scars cannot be completely removed, their appearance can be improved. Methods for improving the appearance of scars include: Topical treatments, such as vitamin E, cocoa butter cream, and several commercial skin care products like Mederma are available over-the-counter with the claim to help heal scars but are not effective Surgery. Although it will not remove a scar, surgery can be used to alter a scar's shape or make it less noticeable. Surgery is not recommended in cases of hypertrophic or keloid scarring (raised scars) because there is a risk of recurring scars as well as more severe scarring that results from the treatment. Steroid injections. A long term course of steroid injections into a scar may help flatten the scar. Injections may help to soften the appearance of keloid or hypertrophic scars. Radiotherapy. Low-dose, superficial radiotherapy is used to prevent recurrence of severe keloid and hypertrophic scarring. This treatment is used only in extreme cases because of potential long-term side effects. Dermabrasion. This treatment involves the removal of the surface of the skin with special equipment. Dermabrasion is useful when the scar is raised above the surrounding skin; but, it is less useful for the treatment of sunken scars. Microdermabrasion is a much less invasive form of dermabrasion and may be useful for very superficial scars. Laser resurfacing. This procedure, similar to dermabrasion, removes the surface layers of the skin using different types of lasers. Newer types of lasers may achieve more subtle results by working on the collagen in the dermis without removing the upper layers of skin. This advancement results in little to no down time as opposed to traditional laser resurfacing and dermabrasion, which requires a longer recovery. Filler injections. These treatments can be used to raise sunken scars to the level of surrounding skin. The effects of these injections are usually only temporary, however, and the procedures may need to be regularly repeated. Newer forms of injectable fillers are now on the market and may be an option for some people. Not written by me : http://www.webmd.com/skin-problems-and-treatments/guide/scars just plagarism :oP

Vitamin E oil. Just buy the capsules, empty, and rub on scar. May take a while but does work if the scar is not too bad.

sand paper.

bio oil works well http://www.bio-oil.com/en/uses.html

Vitamin E oil works very well. They're advertising some cream on tv (can't remember what it's called) but I've never used so I don't know if it really works

They sell stuff but it is expensive and if you Keloid... fat chance it'll work. Try Mederma. Cover when you can't heal

Stay away from sharp objects...