There are several variables that can make an individual more prone to developing acne scars.
Genetics: If you have family members with acne scarring, you are more likely to also experience the issue.
Non-Treatment: Individuals who do not treat their acne are more likely to scar. It is best to get early treatment for acne in order to prevent scarring.
Picking and Touching: Picking at acne causes trauma to the skin that is more likely to result in scarring and prolong the healing process. Some people are not aware that they are picking at their skin.