The belly button, or “umbilicus,” is the scar ... in diameter for people assigned female at birth. Outie belly buttons have what is clinically known as a” mamelon" (a central protruding ...

And on today’s agenda, perhaps the most important question of them all: what causes an “innie” or an “outie” belly button? What is a belly button? Before we get into the ins and outs of ...

People sometimes take this cosmetic option after pregnancy or the removal of a piercing, or just to make an “outie” into an “innie.” The look of your belly button is not related to the ...

An umbilical hernia happens when there's a gap in the muscle directly behind your belly button. A section of your intestine can protrude through that gap, resulting in an “outie” belly button.

Here biologist Sarah Leupen, who teaches human and comparative animal physiology, explains the ins and outs of belly buttons ... an outie; about 10% of people have these. Any concave navel ...