FOR most people, having two nipples in the norm.
But one NHS doctor has now revealed the one place you never knew you could have a nipple.
TikTokers have been making videos about how their moles are actually additional nipples.
Several users posted clips of their extra nipples, with some appearing below the ones on their chest and others showing them in their armpits.
The one thing that most of the videos have in common, is that all of these additional nipples actually appear on the mammary line of a person.
This starts at a person's armpit and goes all the way down, across the breast and ends in the inner thigh.
Posting to TikTok, Dr Karan Rajan said you can actually get nipples on your feet.
The NHS doctor referenced a 2010 medical paper which examined a man who thought he had a mole growing on his foot.
Dr Rajan explained: "It turns out it was actually a nipple and areola complex."
He also said that in 2006 doctors found breast tissue and a nipple on the foot of a woman.
"This is known as a pseudomamma, false breast.
"When doctors removed this lump they even found ducts and sweat glands normally found in the breast.
"Although extra nipples and breast tissue are normally appear on the mammary line, they can technically be anywhere."
Having additional nipples is rare, and Dr Rajan said this occurs in just one per cent of people.
In the comments section he explained that a mammary line is a embryonic remnant and that these nipples found on the feet can in fact sometimes lactate.
People have previously revealed the odd things that nipples can do.
One woman previously revealed that her little boy was born with breasts that lactated.
The condition is caused by high levels of oestrogen in the mother during pregnancy, which transfers over into the baby's bloodstream via the placenta and stimulates breast tissue growth and milk production.
Another woman discovered she could breastfeed from her armpit after she noticed white liquid seeping out.
Doctors examined the patient and found a round, firm lymph node that released white discharge when pressed.
Writing in a case report in the New England Journal of Medicine, doctors in Lisbon, Portugal said the condition was consistent with polymastia.
This is a condition where breast tissue develops along the ridge of the breast.
Previous studies show that this is the most common place for women to develop accessory breast tissue.
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