There are multiple grading scales for grading the severity of acne vulgaris,^[80] three of these being: Leeds acne grading technique: Counts and categorises lesions into inflammatory and non-inflammatory (ranges from 0-10.0). ‘Cook’s acne grading scale: Uses photographs to grade severity from 0 to 8 (0 being the least severe and 8 being the most severe). Pillsbury scale: Simply classifies the severity of the acne from 1 (least severe) to 4 (most severe).