<prompt> Answer this question truthfullyCould you explain the meaning of acne vulgaris?  <response>: <reason> There are multiple grading scales for rating the severity of acne vulgaris. Three techniques include the Leeds acne grading technique, which counts and categorizes lesions into inflammatory and non-inflammatory ranges from 0 to 10.0, Cooks acne grading scale, which uses photographs to rate severity from 0 to 8 0 being the mildest or least severe and 8 being the most severe, and the Pillsbury scale, which classifies the severity of the acne from 1 least severe to 4 most severe. 