Change In Moles During Pregnancy: Causes And When To See A Doctor

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Moles are harmless patches or spots on the skin that may be present at birth or develop over time. Women may sometimes notice a change in moles during pregnancy. These changes may be influenced by the physical and hormonal changes in the body. As a result, women may notice new moles or old moles may disappear. Some may even notice that their moles are growing bigger or darker than usual. Fortunately, these changes do not indicate any risk.

However, if you notice some worrying changes in your mole’s color, size, and texture during pregnancy, it is important to consult a doctor (1).

On the other hand, brown or black moles could be a type of birthmark that are known as congenital moles or congenital melanocytic nevi. They are usually caused by an overgrowth of pigment cells and could have become hairy and darker during puberty.

Read this post to know more about the changes moles undergo during pregnancy, the reasons behind it, and the symptoms you should not ignore.

In This Article

Is It Normal For The Moles To Change During Pregnancy?

Minor changes in the moles may occur during pregnancy
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During pregnancy, the moles you already have may undergo minor changes. Some, especially those present on the abdomen and breasts, may become larger and darker. These are benign changes that could happen due to the stretching of the skin or fluctuating hormone levels or hormonal imbalance (2) (3).

However, in rare cases, moles that change asymmetrically could become malignant (cancerous) and may require dermatological care. You should get it checked by a specialist for care before they could negatively impact maternal health or fetus development.

What Causes Moles To Develop During Pregnancy?

New moles may develop due to hormonal changes in pregnancy (4). The increasing hormonal levels of estrogen and progesterone stimulate the melanocytes (cells producing melanin pigment) to produce more pigment (5). Melanin is a natural pigment that gives your skin its natural color and is also known for causing skin pigmentation. Moles thereby appear where there is a concentration of pigment-making cells in the skin.

Do Moles Get Itchy When Pregnant?

A mole may get itchy during pregnancy due to the changes it undergoes
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Moles may get itchy when the nerves of the skin get irritated or experience changes. The irritation may be from the chemicals that you apply to the skin, peeling of the skin from sunburn, or dry skin (6). In some cases, a mole could turn itchy solely due to the changes it undergoes (stretching skin or hormonal surge).

When Do Moles Get Harmful?

Raised moles need medical attention
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In general, moles have even pigmentation, distinct edges, and a smooth surface. Checking the changing moles and also examining the emerging moles for the warning signs and symptoms is important to determine if they need medical attention. Talk to your doctor or a dermatologist for the right diagnosis if the moles:

  • Have uneven or ragged borders
  • Have uneven color tone, either become darker or have varied colors
  • Form flakes and crusts
  • Are itchy
  • Bleed and cause pain
  • Are raised from the skin surface

These changes could happen over weeks and months. In some cases, these could be signs of melanoma, a type of skin cancer (1).

Is Mole Removal Safe During Pregnancy?

Lidocaine can be used to numb the area for a mole excision
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There is limited study on the safety of mole removal in pregnant women. The local anesthetics, such as lidocaine, used to numb the area for a mole excision are relatively safe to use in pregnancy, but in small doses (7). However, higher doses and exposure during the first trimester could have teratogenic effects on the fetus.

Do Pregnancy Moles Go Away After Childbirth?

Pregnancy moles are likely to go away after delivery, unless they are malignant, in which case they warrant medical intervention (2).

What Is Melanoma And How To Look For It During Pregnancy?

Melanoma appears as a new mole or changes existing mole into a cancerous one
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Melanoma is a type of skin cancer that develops from pigment-producing cells (melanocytes). It either appears as a new mole or changes an existing mole into a cancerous one. According to the National Cancer Institute, there were an estimated 1,413,976 people living with melanoma of the skin in the US, in the year 2020. The specific genetic factor that contributes to acquired melanocytic moles remains unknown but developing large numbers of moles may be an autosomal dominant trait. It is also likely to occur from exposure to UV rays from the sun and also tanning beds (8).

The signs and symptoms of melanoma in pregnant women are the same as those in non-pregnant women. To evaluate the changes, you can follow the ABCDE rule. This rule for self-examination of the skin was introduced by a group of dermatologists as ABCD in 1985 and was later expanded to ABCDE in 2004 (9).

  • A is for Asymmetry, which means that half of the mole looks different from the other half in color, shape, or texture.
  • B is for Border irregularity, which implies that the border is irregular or ragged with no defined edges.
  • C is for Color variation, meaning the color is not uniform throughout the mole and has shades of brown, tan, black, red, or even blue and white.
  • D is for Diameter, which suggests that moles greater than six millimeters could be malignant.
  • E is for Evolving; this is also known as ‘the ugly duckling sign,’ where some moles look different from other moles. They change or enlarge with time, and that can be a cause for concern.

If you have a mole that meets one or more of the above criteria, you should consult a doctor immediately.

protip_icon Experts say
According to the American Academy of Dermatology, melanoma can be tested through skin biopsy, and less advanced stages can be treated the same way as in a non-pregnant woman (10).

Melanoma Treatment, And The Implications It May Have On The Growing Baby

Treatment for pregnant melanoma patients is usually the same as it is for anyone else. Also, the treatment depends on the stage of melanoma.

  • For early-stage melanoma, treatment may involve a surgery where the melanoma is removed after the administration of a local anesthetic. Also, a section of healthy skin that surrounds the melanoma is removed, and the surgery is usually considered safe to undergo while pregnant.

Leah, a mother of four, shares her story about dealing with skin cancer while pregnant, “I noticed a beauty mark on my forehead that I hadn’t noticed before. It was right above my eyebrow. I was pregnant at the time. So, I went to the dermatologist, who ordered a biopsy. He scraped it off with a razor or something similar. To make a long story short, I had basal cell carcinoma! My doctor quickly introduced me to a plastic surgeon. Surgery was scheduled for one month after my due date. The dermatologist and the surgeon both agreed that I was too young to be dealing with this, but it runs in my family, and also, yes, I was a sun worshiper. I live near the beach; I have a fair complexion. What else is there to say?

“Delivered my baby and then two weeks later, the dreaded appointment. Basically, the doctor cuts around the spot, sends that sample down the hall for the pathologist to look at, and then decides if any more needs to be removed. The incision was vertical, so the skin could be pulled closed easily. The pathologist found cancer at the top of the incision as well as in the original place. I’m not sure how many stitches there were, but my face was swollen for a couple of days, but in the end, it healed well (i).”

  • For advanced-stage melanoma that has spread, chemotherapy and immunotherapy may be the options. Both are not recommended during pregnancy as they pose serious side effects, such as risks of birth defects and spontaneous abortion (2).

Can Melanoma Spread To The Baby?

Melanoma is not likely to spread to the baby. In late-stage cancer, when the internal organs are affected, there might be a risk of cancer spreading to the placenta and the baby. In this case, the placenta needs a thorough examination, and the baby should be under a dermatologist’s supervision (10).

protip_icon Things to know
Healthy babies born to mothers with metastatic pregnancy-associated melanoma in the placenta are followed up for at least 24 months (11).

Frequently Asked Questions

1. Can changes in moles during pregnancy be hereditary?

Moles are benign aggregations of melanocytes caused by an alteration in the proteins that manage these cells. Research has been done to determine the genetic influence of BRAF and other similar genes on changing melanocyte cell aggregations. However, little evidence exists to establish the relationship between pregnancy mole changes and these genetic factors (12).

2. What can pregnant women do to protect themselves from changes in moles?

Changes in moles during pregnancy are quite common due to hormonal changes and do not require remedies or preventive measures. However, do speak to a doctor if you notice sudden changes in existing moles or the appearance of new moles (13).

3. How can pregnant women protect their skin from sun exposure and prevent the formation of new moles?

One of the best ways for pregnant women to protect their skin is to stay indoors as much as possible. You can also opt for protective measures against harsh direct sunlight and harmful UV rays by using sunscreen and protective clothing when you venture out in the sun (14).

4. Is it safe to use topical treatments for existing moles during pregnancy?

There have been cases where applying topical treatments on existing moles has caused serious skin injury. Therefore, before using any such topical treatment, you should consult your doctor and check the components of that topical application (15)(16).

The fluctuations in hormone levels may lead to change in moles during pregnancy. The mole changes brought by the pregnancy-related conditions usually diminish on their own after the delivery. However, if they have taken an irregular shape or if they worry you, it is safe to get them checked by a dermatologist. The medical team would perform a proper diagnosis of the mole to determine its state of normalcy. A malignant mole would be treated promptly.

Alternatively, follow a good skin care routine and avoid sun exposure. Always use dermatologically-approved sunscreens based on your skin type. Visit a dermatologist regularly to identify any skin issues in their early stages.

Infographic: When To Inform Your Doctor About Your Moles During Pregnancy?

Pregnancy can sometimes cause moles to change in size, shape, or color due to hormonal fluctuations. However, if a mole appears suddenly or undergoes significant changes during pregnancy, it is essential to have it evaluated by a healthcare provider. Scroll through the following infographic for a list of other signs you should be aware of.

when do moles get harmful (infographic)

Illustration: Momjunction Design Team

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Key Pointers

  • Pregnancy can cause hormonal changes that make existing moles more prominent or darker, and increase their number.
  • Moles with even pigmentation, distinct edges, and smooth surface are considered normal.
  • It is important to check for any changes or warning signs of skin cancer with a dermatologist.
  • In most cases, pregnancy-related moles will disappear after childbirth.
  • However, if there are any malignant instances, they need to be treated immediately.
  • Melanoma, a type of skin cancer, may appear as a new or changing mole, but it is unlikely to spread to the baby.

Personal Experience: Source


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. Moles; NHS (2017)
2. Moles and Malignant Melanoma; European Academy of Dermatology and Venereology (2018)
3. Skin Changes During Pregnancy; Health Sciences Library Upstate Medical University (2008)
4. Are moles determined by genetics; U.S. Department of Health & Human Services National Institutes of Health (2017)
5. Gilvan Ferreira Alves et al.; Dermatology and pregnancy; An. Bras. Dermatol (2005)
6. My Mole Itches But Doesn’t Hurt, What Does This Mean; Skin Center of South Miami
7. Ji Min Lee and Teo Jeon Shin; Use of local anesthetics for dental treatment during pregnancy; safety for parturient; Journal of Dental Anesthesia and Pain Medicine (2017)
8. Skin cancer (melanoma); NHS
9. Daniel Jensen and Boni E. Elewski; The ABCDEF Rule: Combining the “ABCDE Rule” and the “Ugly Duckling Sign” in an Effort to Improve Patient Self-Screening Examinations; The Journal of Clinical and Aesthetic Dermatology (2015)
10. Melanoma During Pregnancy: What It Means For You And Your Baby; American Academy of Dermatology Association
11. Melanocytic Naevi And Melanoma In Pregnancy; DermNet
12. Are moles determined by genetics?; National Library of Medicine
13. Skin Changes During Pregnancy; American Pregnancy Association
14. Sun-damaged Skin (Photoaging); Cleveland Clinic
15. Pina Bozzo et al.; (2011);Safety of skin care products during pregnancy; NCBI
16. Karen Konkel et al.; (2023);Serious Skin Injuries Following Exposure to Unapproved Mole and Skin Tag Removers; NCBI

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