II. Physiology

  1. Melanocyte stimulating hormone rises in early pregnancy
  2. Increased Melanin deposition

III. Signs: General

  1. Scarred areas and nevi darken
  2. Pigmented areas become more pigmented
    1. Areola
    2. Axilla
    3. External genitalia
    4. Anal region
    5. Linea Nigra

IV. Signs: Specific

  1. Chadwick's Sign
    1. Darkened vulva and vagina
  2. Melasma or Chloasma (Mask of pregnancy)
    1. Dark areas under eyes and bridge nose
  3. Linea Nigra
    1. Dark midline low Abdomen

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Ontology: Linea nigra (C0278057)

Concepts Finding (T033)
SnomedCT 90751002
English linea nigra (physical finding), linea nigra, abdomen linea nigra, Linea nigra, Pigmentation of linea alba of abdomen, Linea nigra (finding)
Spanish línea negra (hallazgo), línea negra, línea nigra, pigmentación de la línea alba del abdomen