How do I speed up the red marks fading (after acne)?

For best results, find yourself a Cocoa Butter lotion with Vitamin E and use that, it should do the trick for you-- forget the lemon stuff. You should stop using the the Benzoyl Peroxide creams if you no longer need them, and if you do, then you don't want to use them at the same time you use the lotion. Good luck.