what’s that line on a Woman’s belly coming up to her bellybutton and why do sometimes women that never been pregnant gets it?

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what’s that line on a Woman’s belly coming up to her bellybutton and why do sometimes women that never been pregnant gets it?

In: Biology

The line is called “linea nigra” (Latin: “black line”). https://en.wikipedia.org/wiki/Linea_nigra

It is caused by hormones during pregnancies and can happen rarely outside of pregnancy, e.g. during puberty, probably also due to hormonal stimulation of the cells in the skin that make it darker in this small region.

Not so fun fact, when I was a kid I asked my Mum where babies came from, she told me that dark line below a ladies belly button.