Atrophic rolling scars are rolling semi-circular scarring that can occur as a result of the acne healing process, injury or surgery. They appear as indentations in the skin and tend to measure a few millimeters wide. They are defined according to their sloping edges, which give the skin a wavy, uneven appearance. Rolling scars in acne are not always the same size as their size depends on how the skin heals. Rolling scars are more common in facial areas where the skin is thicker, such as the lower cheeks and jaw.