Acne spots

I normally have very clear skin. But, a few weeks ago my face broke out really bad, I have no idea what caused it & it is just now cleared up. However it left behind a few dark spots & I wanted to know if anyone has some suggestions on a product that will fade them. I know there are a few products out there that claim to clear up acne & the spots they leave behind. But, do any of them actually work? Thanks for any & all advice :)