| Variable | HENE + Clindamycin | Clindamycin | p | |
| Age (year) | 22.6 ± 4.8 | 21.7 ± 5.1 | >0.05 | |
| Sex | Male | 4 | 4 | >0.05 |
| Female | 27 | 26 | ||
| Severity | Moderate | 20 | 20 | >0.05 |
| Mild | 11 | 10 | ||