Classification an acne vulgaris in degrees of severity according to the number of papules and pustules.
| Severity | Description |
| Grade I | <10 papules and pustules/half of face |
| Grade II | 10 to 20 papules and pustules/half of face |
| Grade III | 20 to 30 papules and pustules/half of face |
| Grade IV | > 30 papules and pustules/half of face |
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