DEAR MAYO CLINIC: What is the best way to treat acne scars that are a few years old? How effective and safe are treatments?
ANSWER: A variety of treatments can be used to help reduce the appearance of acne scars. To be most effective, the inflammatory phase of acne that includes active pimple formation and redness needs to be resolved before treatment for scarring begins.
Moderate to severe cases of acne can result in scars that cause discoloration and indentations in the skin. In most cases, acne scars do improve over time without treatment. That's particularly true of discoloration. Indentations may be more stubborn and less prone to disappearing on their own.