Melanin: The genitals like the rest of our skin has melanin. Age, hormonal changes and pregnancy (especially pregnancy) increases the production of melanin in the genital region and nipples. It can also cause a line on the abdomen called a linea nigra. However, this is different than moles, which can also happen on the labia. If you suspect a mole, then you might want that evaluated.
Answered 5/31/2015
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