In a nutshell
A small skin mark present from birth may be an accessory nipple. It often lies along an imaginary line between the armpit and groin and is initially mistaken for a mole. Whether breast gland tissue also lies beneath it varies from person to person.
Why does it happen?
During embryonic development, milk lines form and normally regress almost completely. If corresponding tissue remains at an additional site, another nipple can develop there.
Frequency
Accessory nipples occur in a portion of the population and are sometimes overlooked. Estimates differ by population and examination technique.
Frequency is a qualitative description, not your individual probability.
Is it normal?
If stable and symptom-free, it is usually harmless.
When to seek advice
Newly growing lumps, discharge, retraction, or bleeding should be medically assessed.
Does this happen to you?
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Sources (1)
- DermNet: Supernumerary nipple (opens a new tab)
This source supports the description and physiological context of this entry.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
