Dark Line On Stomach, Not Pregnant: Causes And How To Get Rid Of It

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Linea nigra refers to the dark vertical line that usually appears on the abdomen during pregnancy. Although it is associated with pregnancy, some women may experience linea nigra without pregnancy (1). Environmental factors and certain hormonal changes may usually be responsible for linea nigra in non-pregnant women.

The linea nigra usually goes across the abdomen, passing through the belly button towards the lower abdomen (2). The common cause of it during pregnancy is the melanocyte-stimulating hormone, causing linear melanin deposit. Read this post to know the various causes of linea nigra with and without pregnancy.

How Does A Linea Nigra Look Like?

Linea Nigra is different from melasma

Image: Shutterstock

The clinical features of linea nigra are (2) (3):

  • Typically it measures around a centimeter in width and is a vertical line from your belly button to your pubic bone.
  • Width of the linea nigra may increase during pregnancy.
  • Can also extend up to the upper abdomen.
  • Prominence may vary depending on your skin tone.
  • Dark color of the line can vary from brown to grayish-black.
  • Linea nigra is different from melasma (mask of pregnancy), a skin condition with dark patches on the face. The origin of melasma is also due to hormonal variations, and patches may stay for long or disappear after pregnancy.

Can You Have Linea Nigra Without Pregnancy?

The linea nigra can appear in a non-pregnant woman due to hyperpigmentation. According to the Journal Of The National Medical Association, linea nigra may be found in 75% of women during pregnancy (4). It also reports that 8% of non-pregnant women may have the dark line. The study also finds the involvement of certain co-factors to manifest the dark line.

The appearance of linea nigra is most often an aesthetic issue, and its appearance does not raise any concern. The dark line can appear in male and female populations at any age (4).

If the dark line is bothering you, consult your physician to understand any clinical relevance. Your doctor may suggest some laboratory tests to understand any underlying health issues.

Some causes of linea nigra in non-pregnant women are (3) (4) (5) (6):

  • Age: Hormonal changes during puberty and menopause may contribute to skin darkening and linea nigra. Hormones, such as estrogen, accelerate melanin production.
  • Sun exposure: Prolonged sun exposure without protection from sunscreen or clothing might cause hyperpigmentation.
Prolonged sun exposure might cause hyperpigmentation

Image: Shutterstock

  • Hormonal birth control: Birth control pills containing estrogen can trigger melanin pigmentation and cause linea nigra.
  • Pseudocyesis: False pregnancy (pseudocyesis) can also cause linea nigra.
  • Addison’s disease: Abnormality in the adrenal gland can trigger an increase in the melanin levels in the body. This may also cause a linea nigra and darkening of the skin in the belly region.
  • Polycystic ovary syndrome (PCOS): PCOS is a hormonal disorder accompanied by enlarged ovaries. It is associated with elevated androgen levels (male hormone), which causes skin darkening.

When Does Linea Nigra Appear During Pregnancy?

Linea Nigra fades into a lighter shade after childbirth

Image: Shutterstock

The dark line appears in response to the hormonal changes during pregnancy. Following are the clinical features of linea nigra (3):

How To Get Rid Of Linea Nigra Naturally?

Some natural remedies may help improve the skin darkening (3) (7) (8) (9):

  • Cocoa butter is widely used for aesthetic purposes. It moisturizes the skin and keeps it tender. It also helps reduce stretch marks and linea nigra.
Cocoa butter reduces stretch marks and linea nigra

Image: iStock

  • Coconut oil helps moisturize the skin and ease the linea nigra and stretch marks on the body.
  • Vitamin-E oil can be applied to darkened skin or stretch marks. Regular application can help improve skin conditions.
  • Lemon juice has skin healing properties and may help lighten the dark line on your belly.
Lemon juice, when rubbed on the belly, may lighten the dark line

Image: iStock

  • The deficiency of some nutrients such as folic acid might be causing skin darkening. Improving lifestyle and nutritious diet may help gain healthier skin. Food such as green vegetables and cereals are a good source of folic acid.
  • Nutgrass (Cyperus rotundus) extracts help improve linea nigra.

Linea nigra is a sign of pregnancy in some women. It marks a linear melanization over the belly region. Most non-pregnant women can also have the dark line due to underlying health issues. Consulting your health care provider, maintaining a healthy diet, and applying natural remedies may help lighten the dark line.

Frequently Asked Questions

1. How common is linea nigra?

More than 90% of pregnant women develop linea nigra during pregnancy. According to a study, approximately 16% of non-pregnant women can get linea nigra. It has also been seen in older men and children during their early teen years (3).

2. Can linea nigra appear before the missed period?

Linea nigra can appear in the early weeks of pregnancy. However, missed periods are one of the prominent signs of pregnancy. Some women may have linea nigra for reasons other than pregnancy, which can appear before a missed period. You may look for the accompanying symptoms and visit a doctor if there is any concern.

3. Is it normal to have a crooked linea nigra?

In most women, linea nigra can be crooked or squiggly, and it is not always a straight line. The line may vary according to the pigmentation. However, a crooked linea nigra is not a cause of concern.

Key Pointers

  • Linea nigra is a vertical dark line seen during pregnancy due to hormonal changes.
  • Non-pregnant individuals may experience it due to PCOS, sun exposure, or adrenal gland abnormality.
  • Home remedies such as coconut oil, lemon juice, and nutgrass may help you cope with it.

References:

MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
  1. Linea Nigra: Pregnancy Line.
    https://americanpregnancy.org/healthy-pregnancy/pregnancy-concerns/pregnancy-line-linea-nigra/
  2. Remedies to Get Rid of Linea Nigra If You\’re Not Pregnant.
    https://www.newhealthadvisor.org/Linea-Nigra-Not-Pregnant.html
  3. Linea nigra.
    https://dermnetnz.org/topics/linea-nigra
  4. The incidence of lower mid-trunk hyperpigmentation (linea nigra) is affected by sex hormone levels.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2569341/?page=3
  5. Pseudocyesis.
    https://www.npjournal.org/article/S1555-4155(16)00222-1/pdf
  6. The influence of hormones on melanogenesis.
    https://pubmed.ncbi.nlm.nih.gov/12304881/
  7. B vitamins and folic acid.
    https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-b/
  8. How To Get Rid Of Linea Nigra After Giving Birth?
    https://www.pregworld.org/how-to-get-rid-of-linea-nigra-after-giving-birth/
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Anshuman Mohapatra

Anshuman Mohapatra is a biotechnology scientist with more than six years of research experience in analytical chemistry and biotechnology. He has submitted his PhD thesis at the Indian Institute of Technology Guwahati (IIT Guwahati) and served as a research fellow (JRF/SRF) during his PhD tenure. His research interest includes analytical chemistry, neurobiology and lipid disorder diseases. Three of his research...
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Dr. Tamami Chowdhury

(MBBS, DGO)
Dr Tamami Chowdhury is a renowned gynecologist in Siliguri, West Bengal, and practices at Mitra Nursing home. During her 16 years of experience, she has helped women to have a successful pregnancy outcome without stress. She guides them in their diet, medicines and other health-related issues. Dr. Chowdhury helps women understand the process of pregnancy and address their fear. She...
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