Clinically, approximately 95% of acne patients will develop acne scarring. Ice chisel-like and atrophic scarring predominates on the face, atrophic scarring on the trunk, and hyperplastic scarring on the extremities and neck. The grading of acne scarring is also important for evaluating the severity of acne. The more commonly used grading method is: acne scar overall grading method.
Grade 1: patchy scar, mainly color change; Grade 2: mild atrophic or hyperplastic scar, not observable at normal social distance (50 cm or more), can be covered by cosmetics or hair; Grade 3: moderate atrophic or hyperplastic scar, observable at normal social distance, cannot be covered by cosmetics or hair, can be flattened by manual pulling; Grade 4: severe atrophic or hyperplastic scar, not observable at normal social distance. A severe atrophic or hyperplastic scar that can be observed at normal social distance, cannot be covered by cosmetics or by hair, and cannot be flattened by manual traction.