Table 1.

Atrophic Acne Scar Subtypes

Scar Type	Morphology
Ice Pick	Diameter: <2 mm Depth: Lower dermis/subcutis Visual: V-shaped, pitted appearance
Boxcar	Diameter: 1–4 mm Depth: Upper dermis (shallow) or lower dermis (deep) Visual: Round or geometric appearance with vertical walls and flat base
Rolling	Diameter: ≥4 mm Depth: Upper dermis Visual: Slopy, undulating appearance caused by fibrotic tether of dermis to subcutaneous layer

Notes: Adapted from J Am Acad Dermatol, 45(1), Jacob CI, Dover JS, Kaminer MS. Acne scarring: A classification system and review of treatment options. 109–117, copyright 2001, with permission from Elsevier.⁴