“…ECCA grading scales are based on semiquantitative, weighted assessments of 6 types of acne scars, namely, V-shaped atrophic scars, U-shaped atrophic scars, M-shaped atrophic scars, hypertrophic inflammatory scars, keloid scars, and superficial elastolysis. 31 Standardized digital photographs were obtained prior to laser treatments and subsequent follow-up photographs were taken using identical camera settings (Nikon D70, Tokyo, Japan) and lighting conditions. To elucidate relationships between acne scar subtypes and response to laser treatments, we classified acne scars into 5 subtypes according to shape and depth (ie, superficial or deep rolling, superficial or deep boxcar, and icepick scars).…”