Skin Darkening, Linea Nigra, and Melasma in Pregnancy
Medically reviewed by Dr. Lisa Okafor, MD, FACOG · Board-Certified OB-GYN
Content reviewed against published ACOG, NIH, AAP guidelines
Last reviewed:
Your health matters just as much as your baby's. If you are dealing with skin darkening, linea nigra, and melasma in pregnancy, here is what you need to know.
The short answer
Skin darkening (hyperpigmentation) during pregnancy is very common and affects up to 90% of pregnant people. It is caused by increased melanin production driven by pregnancy hormones. Common changes include the linea nigra (dark line on the belly), melasma (dark patches on the face), and darkening of the areolas, freckles, and moles.
Key takeaways
- Skin darkening (hyperpigmentation) during pregnancy is very common and affects up to 90% of pregnant people. It is caused by increased melanin production driven by pregnancy hormones. Common changes include the linea nigra (dark line on the belly), melasma (dark patches on the face), and darkening of the areolas, freckles, and moles.
- Usually normal when: Gradual darkening of the linea nigra, areolas, and existing moles or freckles
- Call your doctor if: A mole is growing rapidly, has irregular borders, multiple colors, or is bleeding - these warrant prompt dermatologic evaluation
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to ACOG, NIH, AAP guidelines, skin darkening (hyperpigmentation) during pregnancy is very common and affects up to 90% of pregnant people. It is caused by increased melanin production driven by pregnancy hormones. Common changes include the linea nigra (dark line on the belly), melasma (dark patches on the face), and darkening of the areolas, freckles, and moles. At First trimester, you may notice your areolas starting to darken and existing freckles or moles becoming more pronounced. This is normal and caused by hormonal stimulation of melanin-producing cells. Start using broad-spectrum sunscreen daily, as sun exposure can worsen pigmentation changes. It is generally considered normal when gradual darkening of the linea nigra, areolas, and existing moles or freckles. However, you should contact your pediatrician promptly if a mole is growing rapidly, has irregular borders, multiple colors, or is bleeding - these warrant prompt dermatologic evaluation.
Normal vs. Concerning
By Age
What to expect by age
First trimester
You may notice your areolas starting to darken and existing freckles or moles becoming more pronounced. This is normal and caused by hormonal stimulation of melanin-producing cells. Start using broad-spectrum sunscreen daily, as sun exposure can worsen pigmentation changes.
Second trimester
The linea nigra (a dark vertical line running from the navel to the pubic bone) typically appears in the second trimester. Melasma - brown or grayish patches on the forehead, cheeks, nose, and upper lip - may also develop. Sun protection with SPF 30+ sunscreen and a wide-brimmed hat can help minimize melasma.
Third trimester
Pigmentation changes may become more pronounced. The linea nigra may darken further. These changes are cosmetic and harmless. Most hyperpigmentation fades gradually after delivery, though melasma may persist and require treatment if desired.
Postpartum
Most pregnancy-related skin darkening fades within months of delivery. The linea nigra gradually fades but may never completely disappear. Melasma may take longer to improve and can recur with sun exposure or hormonal contraceptives. If melasma is bothersome, talk to a dermatologist about safe treatment options while breastfeeding.
What to Tell Your Pediatrician
- Describe when you first noticed skin darkening, linea nigra, and melasma in pregnancy and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if a mole has changed in shape, size, color, or borders, or is bleeding.
- Mention if new skin growths or lesions that look unusual.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Gradual darkening of the linea nigra, areolas, and existing moles or freckles
- Symmetric brown patches on the face (melasma) that developed during pregnancy
- Darkening in skin folds like the armpits and groin
- Changes appeared gradually alongside other pregnancy changes
- A mole has changed in shape, size, color, or borders, or is bleeding
- New skin growths or lesions that look unusual
- Melasma is causing significant distress and you want to discuss treatment options
- A mole is growing rapidly, has irregular borders, multiple colors, or is bleeding - these warrant prompt dermatologic evaluation
- Widespread skin changes accompanied by severe itching, which could indicate a different condition like cholestasis
What You Can Do at Home
- Keep track of when you notice skin darkening, linea nigra, and melasma in pregnancy — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that gradual darkening of the linea nigra, areolas, and existing moles or freckles — this is generally within the range of normal.
- At First trimester, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Prioritize your own rest and nutrition. Accept help when offered, and do not hesitate to reach out to your healthcare provider.
- While monitoring at home, seek immediate care if a mole is growing rapidly, has irregular borders, multiple colors, or is bleeding - these warrant prompt dermatologic evaluation.
Related Conditions
Stretch Marks During Pregnancy
Stretch marks (striae gravidarum) affect up to 90% of pregnant people and occur when the skin stretches rapidly as the belly, breasts, and hips grow. They appear as pink, red, or purple streaks and gradually fade to silver or white after pregnancy. Genetics plays the biggest role in whether you develop them.
Itchy Skin During Pregnancy (Non-Cholestasis)
Mild itching during pregnancy is very common and usually caused by the skin stretching, dry skin, or hormonal changes. It typically affects the belly, breasts, and thighs. While usually harmless, severe or widespread itching, especially on the palms and soles, should be evaluated to rule out cholestasis of pregnancy.
Related Resources
Postpartum Recovery Guide
Week-by-week postpartum recovery timeline and warning signs.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is skin darkening, linea nigra, and melasma in pregnancy normal?
When should I call the doctor about skin darkening, linea nigra, and melasma in pregnancy?
When is skin darkening, linea nigra, and melasma in pregnancy normal?
What causes skin darkening, linea nigra, and melasma in pregnancy?
What should I mention to my pediatrician about skin darkening, linea nigra, and melasma in pregnancy?
Is skin darkening, linea nigra, and melasma in pregnancy normal at First trimester?
Is skin darkening, linea nigra, and melasma in pregnancy normal at Second trimester?
Should I go to the ER for skin darkening, linea nigra, and melasma in pregnancy?
Does skin darkening, linea nigra, and melasma in pregnancy go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Skin Darkening, Linea Nigra, and Melasma in Pregnancy.
Things to mention
- Describe when you first noticed skin darkening, linea nigra, and melasma in pregnancy and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if a mole has changed in shape, size, color, or borders, or is bleeding.
- Mention if new skin growths or lesions that look unusual.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- A mole has changed in shape, size, color, or borders, or is bleeding
- New skin growths or lesions that look unusual
- Melasma is causing significant distress and you want to discuss treatment options
Urgent signs to report immediately
- A mole is growing rapidly, has irregular borders, multiple colors, or is bleeding - these warrant prompt dermatologic evaluation
- Widespread skin changes accompanied by severe itching, which could indicate a different condition like cholestasis
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of skin darkening, linea nigra, and melasma in pregnancy are normal. Talk to your pediatrician if a mole is growing rapidly, has irregular borders, multiple colors, or is bleeding - these warrant prompt dermatologic evaluation.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Maternal Concerns
Stretch Marks During Pregnancy
Stretch marks (striae gravidarum) affect up to 90% of pregnant people and occur when the skin stretches rapidly as the belly, breasts, and hips grow. They appear as pink, red, or purple streaks and gradually fade to silver or white after pregnancy. Genetics plays the biggest role in whether you develop them.
Itchy Skin During Pregnancy (Non-Cholestasis)
Mild itching during pregnancy is very common and usually caused by the skin stretching, dry skin, or hormonal changes. It typically affects the belly, breasts, and thighs. While usually harmless, severe or widespread itching, especially on the palms and soles, should be evaluated to rule out cholestasis of pregnancy.
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