Sometimes called the “pregnancy line”

Pregnancybrings changes to many areas of the body, including the skin.

Some skin changes can indicate a problem or complication, but others are simply cosmetic, like linea nigra.

This line runs vertically from the breastbone to the pubic area and down the middle of the abdomen.

Close-up on the torso of a pregnant woman cradling her large belly. There is a dark, vertical line running from the top to the bottom of her belly.

RuslanDashinsky / Getty Images

This is called the linea nigra (“black line”).

Linea nigra is typically noticed in the second trimester.

RuslanDashinsky / Getty Images

How Common Is Linea Nigra in Pregnancy?

More than 90% of pregnant people have significant and complex skin changes during pregnancy.

According to one study, linea nigra is the most common pregnancy skin change.

What Causes Linea Nigra?

Melanin (the pigment that darkens skin) already exists in greater quantities in some areas of the body.

The increase in melanin production during pregnancy can cause these areas to darken.

Is Linea Nigra Harmful?

Linea nigra from pregnancy is not dangerous.

How Is Linea Nigra Treated?

Treatment for linea nigra isn’t medically necessary.

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MedlinePlus.Skin and hair changes during pregnancy.