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Here's a clue but not the whole story:
Skin darkening. In most pregnant women, hormonal changes cause darkening of skin that is already darker than the rest of the woman?s skin. This darkening may be most obvious in freckles, moles, areolas (colored rings around the breast nipples), nipples, labia (the genital tissue outside of the vagina) and the inner thighs. Some of this darkening may fade after delivery. But these areas are likely to remain darker than they were before pregnancy.
Same changes are likely the same during puberty and aging. Nothing at all to do with diet or poop stains.
Also the nipples in girls darken at puberty...it's hormone related.
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