Dark Brown Acne Marks Please Help!!, Will It Fade Naturally?

I've Had Dark Brown Marks Left By My Acne On My Upper Back And Chest For About 5 Years.It Doesn't Look Like It's Fading Away Naturally So Should I Start Using Creams And Chemical Peels Cause That Helped Greatly On My Face, If So How Long Will It Take To See The Results Of My Marks Fading? If People Can Remove Scars And Freckles Then These Brown Marks Should Go Aways Also Right?