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Linea nigra dark midline streak on a 22 weeks pregnant female.
A Cesarean section scar (horizontal red line) and linea nigra visible on a 31 year old female 7 weeks after childbirth.

Linea nigra (Latin for "black line") is a dark vertical line that appears on the abdomen during about three quarters of all pregnancies.[1] The brownish streak is usually about a centimeter in width. The line runs vertically along the midline of the abdomen from the pubis to the xiphoid process.[2]

It is a type of hyperpigmentation resulting from increased production of the pigment melanin thought to be caused by increased estrogen, the same process that causes the areolas to darken.[3][4] Why this process of hyperpigmentation occurs on the midline of the abdomen is uncertain. Fair-skinned women show this phenomenon less often than women with darker pigmentation. Before it appears it may be more faintly visible as a linea alba ("white line").

Linea nigra tends to appear around the second trimester. After birth, the line fades slowly, but may never disappear entirely, and sun exposure may cause it to recur.[4]

See also

References

  1. ^ Estève E, Saudeau L, Pierre F, Barruet K, Vaillant L, Lorette G (1994). "[Physiological cutaneous signs in normal pregnancy: a study of 60 pregnant women]" (in French). Ann Dermatol Venereol 121 (3): 227–31. PMID 7832550.  
  2. ^ She Knows Network: "What's that line? All about linea nigra"
  3. ^ George AO, Shittu OB, Enwerem E, Wachtel M, Kuti O (May 2005). "The incidence of lower mid-trunk hyperpigmentation (linea nigra) is affected by sex hormone levels". J Natl Med Assoc 97 (5): 685–8. PMID 15926645.  
  4. ^ a b Parents Magazine







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