I've read about this before. I think it's one of the better treamtment plans for acne.
And to answer your question, most laser treatments mostly have scarring afterwards(most of them minimal).
It depends on the severity of your acne, sometimes it doesn't come back, and sometimes it does. It really depends on your body.
You will most likely need to repeat the treatment afterwards.
Have you tried proactive or any other benzoyl peroxide products?