Hi. When you say "brown" scars Im assuming you're talking about the brown stains which are left behind by the acne. That is known as post inflammatory hyoerpigmentation, which can be tackled by many peels which are usually done once in a month. An azelaic acid based cream can also be applied at night. If you're talking purely of acne scars (pits or depressions) then a few treatment modalities exist like, dermaroller, subcision, and laser (preferably CO2). regards, Dr. Zubin Mandlewala MUMBAI