DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Linea nigra. View of a dark line (known as linea nigra) seen running along the stomach of a 32 year-old pregnant woman. Changes of pigmentation in particular areas of the body, such as the nipples, the navel and the face, are not uncommon in some cases of pregnancy. The cause is unknown.
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