Why do people have extra nipples?

Extra nipples were once thought to be a link to our evolutionary past, but the truth is a lot stranger, writes Jason G Goldman.

Third (supernumerary) nipple: Types, causes, and removal

supernumerary nipple - pictures, photos

Third nipple (photo proof) - Glow Community

The triple nipple club: why having a third breast can be natural

The Scientific Reason Harry Styles and Other People Have 4 Nipples

The Surgical Treatment of Bilateral Supernumerary Nipples

The Reason Why Men Have Nipples

What Does Having a Third Nipple Mean? Supernumerary Nipples - GoodRx

Your Mole May Actually Be a Third Nipple — Here's How to Tell

Supernumerary Nipple: Causes, Diagnosis, and Images — DermNet