Acne scarring can be categorised as (Goodman & Barron)
- Grade 1 – macular scarring or flat scarring that is characterised by flat areas of increased or decreased pigmentation visible from greater than 50cm
- Grade 2 – mild disease that is visible at distances of less than 50cm and can be covered by make-up. Examples include mild rolling acne scars.
- Grade 3 – moderate disease that is visible at 50cm or greater and is not easily covered with make-up or the normal shadow of a shaved beard hair. Stretching the skin can flatten the scar. Examples include more significant rolling scars, shallow boxcar scars, and mild to moderate hypertrophic scars
- Grade 4 – severe disease as in grade 3 but scarring is not flattened by stretching the skin. Examples include severe boxcar scars, deep divots, ice pick scars, and hypertrophic keloid scarring (very raised/pigmented scars).