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A member asked:
Could use expert help with why are outy belly buttons so rare?
A doctor has provided 1 answer
Type of scar: In humans, the navel scar can appear as a depression (often referred to colloquially as an innie) or as a protrusion (outie). About 90% of humans have innies. The occurrence of an outie navel is caused by the extra skin left from the umbilical cord. As navels are scars, and not defined by genetics, they can serve as a way of distinguishing between identical twins.
Answered 7/18/2014
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