I posted this on another persons topic a couple days ago. Your goal is to clear your skin. A goal requires steps. For one to move onto the next step, prior steps must be completed to get to your desired goal. Worry about post acne marks after you are done clearing all your acne (or most of it). Give it another month or so. Then worry about it.
Its like trying to treat post acne marks whilst on accutane. You must finish that step you started and worry about the next later.