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. 2023 Jan 18;16:125–134. doi: 10.2147/CCID.S397888

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 tethering of dermis to subcutaneous layer

Notes: Reproduced with permission from Dove Medical Press. Tam C, Khong J, Tam K, Vasilev R, Wu W, Hazany SA. Comprehensive Review of Non-Energy-Based Treatments for Atrophic Acne Scarring. Clin Cosmet Investig Dermatol. 2022;15:455–469.7