Nipplesare an often-controversial body part, even though they shouldn’t be.

Everyone has two of them, right?

Well, except for people who have three.

Man with exposed nipples

Yes, third nipples exist, and they’re more common than you might think.

Also called accessory nipples or supernumerary nipples, these extra nubs exist in1 to 5 percent of the population.

The condition is considered a minor birth defect and is officially calledpolythelia.

In some rare cases, a third nipple may be accompanied by extra breast tissue a condition known aspolymastia.

You might be positive that you don’t have a third nipple, but you could be wrong.

“They think they’re a mole.”

Where do third nipples come from?

According to Taylor, many things “form and then regress” at the embryo stage of development.

These third nipples are formed in the womb and, on some people, never fully regress.

They’re typically very small, making them even easier to overlook.

They’re alsomore likely to occur in men.