Key takeaways
- Pregnancy does not appear to increase melanoma risk; skin cancers are simply noticed more often during pregnancy because of extra medical contact and because melanoma is already common in women of childbearing age
- A new or changing mole is never something to write off as “just pregnancy hormones” without a proper look
- Biopsies and excisions, including Mohs surgery, can be done safely under local anaesthetic in any trimester
- Treatment for early-stage skin cancer generally isn’t delayed for pregnancy, because earlier treatment means a better outcome for both mother and baby
- Some specific steps, such as certain imaging or a sentinel lymph node biopsy, can reasonably wait until after delivery in lower-risk cases
Finding a changing mole or a new skin growth while pregnant raises a particular kind of worry: concern for yourself, mixed with questions about what’s actually safe to do about it while you’re expecting.
This deserves a careful, specific answer rather than a vague “ask your doctor.” Here’s what actually changes during pregnancy, and what doesn’t.
Why This Topic Deserves Careful, Separate Attention
Pregnancy understandably changes how people think about anything involving medication, anaesthetic, or surgery. The instinct to be extra cautious is a reasonable one.
But being cautious about a skin cancer diagnosis itself matters just as much as being cautious about treatment. Delaying a proper assessment out of pregnancy-related worry can do more harm than the assessment itself.
Does Pregnancy Increase Melanoma Risk?
According to the Skin Cancer Foundation, there’s no evidence that pregnancy itself raises melanoma risk, even though hormones are known to influence some other cancers.
Melanoma is simply diagnosed relatively often during a woman’s childbearing years regardless of pregnancy, and pregnant women see doctors more frequently, which means a cancer that might otherwise go unnoticed for longer is sometimes caught during routine antenatal contact instead.
Normal Pregnancy Skin Changes vs Changes Worth Checking
Pregnancy genuinely does change skin. Melasma, extra pigmentation, skin tags and small vascular bumps are all common and generally harmless, and melasma in particular usually fades after delivery.
MD Anderson Cancer Center puts the distinction plainly: a mole can darken slightly from extra pigment, but a new spot, a changing size or shape, a sore that won’t heal, bleeds, or crusts, or a scaly or shiny bump deserves a proper look rather than being dismissed as hormonal.
Is It Safe to Have a Biopsy or Excision While Pregnant?
Yes. According to guidance reported in Dermatology Times, surgical procedures including biopsy, excision, and wound closure can be done safely in any trimester, including the first.
A suspicious or changing mole should be biopsied and, if needed, excised promptly rather than put off until after delivery, since this is one of the clearest cases where earlier action genuinely improves the outcome.
What About the Local Anaesthetic Used in Mohs Surgery?
The same source notes that the low doses of local anaesthetic used in dermatologic surgery, including lidocaine, are considered safe during pregnancy. The theoretical risks sometimes raised are exactly that: theoretical, not observed in practice at these doses.
Our guide to local anaesthesia in Mohs surgery covers how this works generally; being pregnant doesn’t change the fundamentals of how the procedure is done.
Why Treatment Usually Isn’t Delayed Until After Birth
For early-stage skin cancer, waiting until after delivery is rarely the safer option. Skin cancers, melanoma in particular, can progress over the months a pregnancy lasts.
Thin, early-stage melanoma is generally treated the same way in pregnant and non-pregnant patients, for exactly this reason: the window where treatment is simplest and most effective doesn’t pause for nine months.
When Some Parts of Treatment Can Reasonably Wait
Not every step has to happen immediately. For lower-risk melanoma, postponing a sentinel lymph node biopsy until after delivery is a reasonable option in some cases, since this particular step hasn’t been shown to improve overall survival on its own.
Higher recurrence risk or node involvement changes this calculation, and that decision is made case by case between you, your dermatology or surgical team, and your obstetric team.
What Changes About Imaging and Staging
If further imaging is needed to check whether a melanoma has spread, pregnancy does shift which tests are preferred. Ionising radiation is limited where possible, with ultrasound and MRI generally favoured instead.
For early-stage disease with low spread risk, imaging usually isn’t needed at all. This is a different situation from BCC or SCC, which are treated with Mohs surgery and very rarely require this kind of staging.
Telling Your Surgical Team You’re Pregnant
Mention your pregnancy as early as possible, even if it doesn’t feel relevant to a skin concern. It shapes decisions around anaesthetic choice, positioning for longer appointments, and whether any further testing is needed.
This is worth raising at your first visit rather than waiting to be asked, since it’s a detail that’s easy to assume is obvious or unimportant.
What Happens After Delivery?
If treatment was completed successfully during pregnancy, breastfeeding is usually fine afterwards. If any treatment is planned after birth instead, check with your dermatologist or obstetrician first, since some medications can pass into breast milk.
Ongoing follow-up matters regardless of timing. Recurrence is most likely within two to three years of treatment, and keeping those appointments is part of the plan, not an optional extra.
FAQ
Can a baby be born with melanoma if the mother has it?
It’s extremely rare, even with advanced melanoma in the mother. In advanced cases, the placenta may be checked at birth as a precaution, and any baby found to have it would be monitored by a dermatologist.
Should I wait until after I’m done breastfeeding to get a mole checked?
No. A changing or suspicious mole should be assessed promptly regardless of pregnancy or breastfeeding status. A biopsy itself doesn’t require stopping breastfeeding.
Does a family history of melanoma change anything during pregnancy?
It doesn’t change how pregnancy itself is managed, but it’s worth mentioning to your GP or dermatologist so your skin checks can be appropriately thorough and timely.
If I’ve had melanoma before, is it safe to get pregnant?
For localised, low-risk melanoma, pregnancy doesn’t need to be deferred. For higher-recurrence-risk cases, waiting around two to three years is often advised; this is a decision to make with your treating team.
Recommended next step
If you’ve noticed a changing mole or new skin growth during pregnancy, find out more about Miss Rakhee Nayar and what to expect from an assessment, whatever stage of pregnancy you’re at.
This article is for general information and does not replace a face-to-face medical assessment. Always tell your dermatologist, surgeon, and obstetric team about a pregnancy as early as possible.
Filed under Skin Cancer Explained
