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Table 1 Korean acne grading system

From: Effects of the myrtle essential oil on the acne skin—clinical trials for Korean women

Grade Description
1 Papulesa ≤ 10
2 Papules 11–30
3 Papules ≥ 31, nodulesb ≤ 10
4 Nodules 11–20, ± mild ongoing scars
5 Nodules 21–30, ± moderate ongoing scars
6 Nodules ≥ 31, ± severe ongoing scars, ± sinus tract
  1. aPapule, acne which is smaller than 5 mm
  2. bNodule, acne which is larger than 5 mm