What Are Montgomery Glands? | The Body’s Hidden Nipple

Montgomery glands are small oil-secreting glands on the areola that lubricate and protect the nipple, especially during pregnancy and breastfeeding.

You probably know your areola isn’t perfectly smooth. Look closely and you’ll spot tiny raised bumps circled around the nipple. Some people assume these are pimples or ingrown hairs that need to be cleared out. They’re actually something far more functional.

Those bumps are Montgomery glands — and they play a surprisingly important role in nipple health, particularly if you’re pregnant or planning to breastfeed. This article covers what these glands do, why they become more visible at certain times, and when they might signal something worth a doctor’s attention.

What Are Montgomery Glands?

Montgomery glands (also called Montgomery tubercles or areolar glands) are tiny sebaceous glands located just beneath the skin on the areola. Sebaceous glands are the same type of oil-producing structures you have on your face and scalp — the ones that keep skin supple.

Each areola typically contains 10 to 15 of these glands, though the number varies. Because the skin on the areola is very thin, the glands are visible as small, raised bumps. Their primary job is to secrete an oily substance that keeps the nipple and areola skin lubricated, clean, and protected.

Think of them as built-in moisturizers for a part of the body that gets a lot of friction — especially during breastfeeding. The oily secretion also has mild antimicrobial properties, which may help keep the area free from infection.

Why the Little Bumps Get More Notice During Pregnancy

You may not think about your Montgomery glands much until you’re pregnant. That’s because hormonal shifts — especially rising estrogen and progesterone — stimulate these glands to enlarge and become more prominent. Many women notice them for the first time in the first trimester.

• Increased visibility: Pregnancy hormones cause the glands to swell, making them look like small, pale bumps. They often appear more raised and noticeable than before pregnancy.
• Colostrum preparation: The glands start secreting more oil in preparation for breastfeeding. This early oil helps condition the nipple and areola for what’s ahead.
• Not a sign of anything wrong: It’s easy to worry when you notice new lumps or bumps on your body. But Cleveland Clinic notes that visible Montgomery glands are a normal, expected pregnancy change.
• Possible mild discomfort: Some women report slight tenderness or sensitivity in the area as the glands enlarge. This usually resolves on its own.
• They can appear even without pregnancy: Menstrual cycles, hormonal birth control, or general hormonal fluctuations can also make them more visible, though less dramatically.

If you’re pregnant and noticing these bumps, there’s usually nothing to worry about. The change is physiological and typically fades after breastfeeding ends.

How These Glands Work During Breastfeeding

Once breastfeeding begins, Montgomery glands become even more active. Their oily secretion helps clean the nipple between feedings and provides a protective barrier against chafing and cracking. This is especially valuable because nursing can be tough on delicate skin.

The milky fluid some women notice after childbirth actually comes from these glands, not just the milk ducts. A 2009 study found that Montgomery glands can secrete a noticeable latescent (milky) fluid in the days following delivery. This is a normal part of the postpartum transition.

Cleveland Clinic’s Montgomery glands definition emphasizes that the secretion helps “lubricate and protect the nipple and areola, which is especially important during breastfeeding.” The oil also has a mild scent that some researchers believe helps newborns locate the nipple, though the evidence is still being explored.

Most of these functions happen automatically. You don’t need to do anything special to “activate” them — your body handles it on its own once hormonal signals kick in.

Can Montgomery Glands Get Blocked or Infected?

Like any sebaceous gland, Montgomery glands can sometimes become blocked. The most common cause is trying to squeeze or pop them, which can push debris deeper into the gland and trigger inflammation.

1. Avoid squeezing: Popping a Montgomery gland can introduce bacteria and lead to a painful infection. The bump will usually resolve on its own within a few days to weeks.
2. Recognize signs of infection: Redness, painful swelling, warmth, or a rash around the nipple area may indicate a blocked or infected gland. A yeast infection is another possibility if you’re also itchy.
3. Warm compresses may help: If a gland feels tender, a warm, damp cloth applied gently for a few minutes can encourage the oil to flow without forcing it.
4. See a doctor if symptoms persist: Healthline recommends seeing your healthcare provider if you notice redness, painful swelling, itching, or a rash that doesn’t improve. This is especially important if you’re breastfeeding, as an infection could affect nursing.

Blocked Montgomery glands are rarely a serious problem, but they can be uncomfortable. The key is leaving them alone and letting your body do its thing.

How Common Are Montgomery Glands in Pregnancy?

If you’re pregnant and wondering whether those bumps are normal, you’re far from alone. Studies have found that between 30 and 50 percent of pregnant women develop visible Montgomery tubercles. That means roughly one in three to one in two pregnant women will notice them at some point.

They tend to appear earliest in the first trimester, often before other pregnancy changes like darkening areolas or breast growth. For many women, this early visibility serves as one of the first physical clues that pregnancy hormones are at work.

Healthline’s percentage pregnant women page notes that the bumps are “perfectly normal” and are simply a sign that your body is preparing for breastfeeding. After pregnancy and weaning, the glands usually shrink back to their pre-pregnancy size, though they may remain slightly more prominent than before.

The Bottom Line

Montgomery glands are a normal, functional part of breast anatomy. They keep the nipple and areola healthy, especially during pregnancy and breastfeeding. You don’t need to do anything special for them — just leave them alone and avoid squeezing. If you notice redness, swelling, or pain, check in with your obstetrician or a lactation consultant to rule out infection.

Your midwife or OB can also confirm whether any changes you’re seeing fall within the expected range for your stage of pregnancy.