The severity of your dark marks/scarring will determine the treatment required.

Apart from just being patient and allowing the dark marks to fade in time, you could try using AHA or products with salicylic acid. The regimen itself (Cleanse, BP and moisturise) does not help with scarring, it only helps to prevent acne. In fact some people find that BP prolongs the appearance of dark marks (not that I personally experienced this).

I have no more acne but I have alot of dark marks/ Scarring any products or things to do to remove these?

Sadly the original 3 step regimen doesn't help with marks. Try incorporating the AHA into your routine. It has helped with dark makrs and the tiny scars lighten. With time these marks will get lighter, AHA helps speed up the process. Also, just remember to apply suncreen so these marks don't get darker. The AHA makes your skin sensitive to the sun.

I did think that the BP was causing my dark marks but having stopped using it and seeing a cyst do its thing on my face I can conclude that its just my damn skin. So I think thats a myth if you ask me.