There is a product "skinanswer" that showed great results but the government filed a lawsuit against the company selling it, for making the claim that it removed darke spots, scars, etc. I know from a good friend who used it for many years, that it is very effective. However, they only have about 5-6 bottles few left, under a different name: Check out this website and call the number for the alternative product.
http://healthspotlight.com/skinanswer.htm

Good luck with it,

Andras