There is no hard evidence that cocoa butter lightens scars, according to WebMD. There is no evidence that vitamin E, another substance commonly used to lighten scars, works either.
However, there are products that can be used to lighten scars. Silicon gel sheeting, a substance available from pharmacists and dermatologists, can fade scars. Bleaching creams can also fade scars when used correctly. If these don't work, laser skin treatment is an option, and microdermabrasion is often used to fade superficial scars. Surgery is also used as a last resort for those with scars. Though surgery cannot completely remove a scar, it can help a scar look better.