Atrophic Acne Scars
Atrophic scars are flat, shallow depressions that heal below the top layer of skin. They are caused by the loss of collagen from the skin due to severe acne, chickenpox, or injuries. There are three main types of atrophic scars: ice pick scars, boxcar scars, and rolling scars.
Ice pick scars
Deep, very narrow scars that penetrate into the dermis, appearing as if the skin has been pierced with a sharp object.
Boxcar scars
Broad, rectangular depressions with steep, defined edges.
Rolling scars
Broad depressions with a sloping edge, giving the skin a wavy texture.