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| Risk factors | Numbers | Percentage (%) |
|---|---|---|
| Congenital inverted nipple | 13 | 36 |
| Milk retention | 7 | 19 |
| Trauma | 7 | 19 |
| History of breast surgery | 6 | 16 |
| Autoimmune diseases | 0 | 0 |
| Hormone replacement therapy | 0 | 0 |
| Family history | 0 | 0 |
| Endocrine hormone disorders | 0 | 0 |
| History of smoking | 0 | 0 |
| No related risk factor | 20 | 56 |
