Hi..for atrophic scars due to acne or chickenpox many treatment options are available like chemical peels, dermaroller, fractional laser, Microdermabrasion and subcision. In an individual we have to combine these procedures or have to do either one or two of these in a sequential manner. But that depends on the type of scars you have.So please consult a dermatologist and start the sessions these procedures give good results in reducing the appearance of scars and also will help in overall facial rejuvenation.