You don't need this (or any cream) to get rid of the dark marks left by acne. These will go away by themselves within a couple weeks with no help from creams. It's because they are not scars, just discoloration of the very top layer of the skin. Save your money. All these companies make tons of profit by selling creams that promise to do what would naturally occur without any help from any cream. We need to learn to be patient although I can understand that people with these marks would want to try anything to hurry the process along.
I get red marks from having a pimple that stay for sometimes months after I get a pimple! The pimple is gone but this little flat red spot is still there, I know it's not a pimple because it's all dried out. Not everything just fades away easily. The top layers of your skin have to come off for marks to go away. It depends on how much you exfoliate, how deep the discoloration goes into the layers of the epidermis, and just how fast your skin grows. The bottom most layer is the cell forming region and the cells migrate to the top where they slowly die, until they reach the top where they're just dried up remains of a cell, which is the skin you feel and touch and is constantly coming off. So it could take a long time for the skin carrying a discoloration to reach the top and come off.
Well, today is my second day using it. I have sun spots on my cheeks that look like big freckles, acne spots, and also a dark spot above my lip that always makes me look like I have a mustache even though I wax it. I will keep everyone posted on how it works for me.