Linea nigra is a condition in which pregnant women experience a darkening (hyperpigmentation) in the midline of the abdomen. The linea nigra will generally fade following the delivery of your baby.
File:Linea nigra, March 13th.jpg - Wikimedia Commons
Linea nigra
Image: Linea Nigra - Merck Manuals Consumer Version
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Linea nigra and stretch marks on pregnant women Stock Photo by ©ruttapum2 157201976