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The linea nigra is the dark vertical line that often appears between the belly button and the pubic area during pregnancy. Hormones, which are also responsible for your darkened areolas, a new crop of freckles and an impressive variety of other skin anomalies (like the mask of pregnancy), are behind this weird little stripe. It will usually fade over a few months, but spending time in the sun can permanently tan it. Eating foods with folic acid might help fade any skin discolorations, so try some leafy green veggies.
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