Atrophic scars can be further sub-classified into ice pick; rolling; and boxcar. The exact prevalence of each scar type is hard to calculate but some estimations report that within atrophic scars, the ice pick type represents 60–75%, boxcar 20–30%, and rolling scars 20–25%.
Ice pick scars are narrow, sharply demarcated, V-shaped tracts, <2 mm in diameter, that usually extend into the deep dermis or the subcutaneous layer. Boxcar scars are wider 1–4 mm in diameter, U-shaped tracts, with sharp, vertical edges that extend 0.1–0.5 mm into the dermis. Rolling scars are characterized by dermal tethering of the dermis to the subcutis. They are generally ≥4 mm in diameter, irregular, with a rolling or undulating appearance.