A white bump on your nipple is almost always harmless. The most common causes are Montgomery glands (tiny oil glands that naturally dot the areola), milk blebs in breastfeeding women, and small clogged pores or cysts. Less often, a white bump can signal an infection or, rarely, a more serious skin condition. What yours is depends on its exact location, size, whether you’re breastfeeding, and any other symptoms you’ve noticed.
Montgomery Glands: The Most Common Cause
Your areola, the darker circle of skin around your nipple, contains specialized oil glands called Montgomery glands. These glands release a lubricating substance that protects your nipple skin from drying out and helps maintain an acidic pH that keeps bacteria and yeast in check. They sit just beneath the skin’s surface, often at the base of tiny hair follicles, and release oil through small openings called tubercles.
Sometimes these glands become more visible and look like small, skin-colored or whitish bumps, similar to goosebumps. The number and size vary widely from person to person. Some people have just a few that are barely noticeable; others have many that are quite prominent. Hormonal changes, especially during pregnancy, can make them swell and become more obvious almost overnight. This is completely normal and doesn’t require treatment.
If one of these glands gets blocked, it can fill with oil and form a slightly raised white or yellowish bump. These blocked glands typically resolve on their own. Resist the urge to squeeze them, which can introduce bacteria and cause an infection.
Milk Blebs During Breastfeeding
If you’re breastfeeding and see a small white, yellow, or clear dot right on the tip of your nipple, it’s likely a milk bleb (also called a milk blister). These form when the lining of a milk duct becomes inflamed and the shed tissue collects at the surface of your nipple, plugging one of the tiny pores where milk comes out. They can be painful, especially during nursing.
The underlying causes include an oversupply of milk, an imbalance between how much milk your breasts produce and how much your baby removes, or bacterial overgrowth inside the ducts. A bleb can also develop when milk dries and seals over a nipple pore.
Soaking the affected nipple in warm saline before feeding can soften the bleb and help it open on its own. Nursing frequently and ensuring a deep latch also help clear the blockage. If a bleb persists or keeps coming back, a lactation consultant can check your baby’s latch and your milk supply balance. Don’t pierce a bleb with a needle at home, as this raises the risk of infection.
Clogged Pores and Small Cysts
The nipple and areola have hair follicles and oil glands just like the rest of your skin, so they can develop the same types of clogged pores. A blocked hair follicle can produce a small, round, dome-shaped bump that moves easily under the skin. These cysts grow slowly and can range from a few millimeters to over two inches, though most stay small. You might notice a tiny dark dot in the center.
A much rarer possibility is a milium, a tiny keratin-filled cyst that appears as a pearly white, dome-shaped papule. On the nipple specifically, milia tend to be slightly larger than the 1 to 4 millimeters typical elsewhere on the body, sometimes reaching 8 millimeters. Only a handful of nipple milia cases have been documented in the medical literature, so this is uncommon.
Both clogged-pore cysts and milia are benign. Small ones often resolve without intervention. Larger or bothersome cysts can be drained or removed by a dermatologist in a quick office visit.
Thrush and Other Infections
A fungal infection called thrush can affect the nipple, particularly in breastfeeding women, since the yeast passes back and forth between mother and baby. Thrush doesn’t typically look like a single white bump. Instead, it causes red or deep pink nipples that may appear shiny with peeling, flaky skin. You might notice tiny blisters, itching, or a burning sensation that persists between feedings. The areola can also be involved.
If your white bump is accompanied by spreading redness, warmth, increasing pain, or any discharge, a bacterial infection could be developing. An infected Montgomery gland or clogged pore can become swollen, tender, and warm to the touch. These infections generally respond well to treatment but do need professional attention rather than home care.
When a White Bump Could Be More Serious
Paget’s disease of the breast is a rare form of cancer that starts in the nipple skin. It doesn’t usually present as a single white bump, but it’s worth knowing the signs because it can initially be mistaken for eczema or a minor skin irritation. Early symptoms include flaky or scaly skin on the nipple, crusty or oozing patches, itching, a burning sensation, and sometimes straw-colored or bloody discharge. A turned-in nipple or a lump in the breast may develop later. Symptoms almost always affect only one breast and typically spread outward from the nipple to the areola.
A simple, painless white bump that sits on the surface of the nipple or areola without any of these additional changes is very unlikely to be Paget’s disease. Still, any nipple change that persists beyond four to six weeks, grows, feels firm or fixed, or comes with nipple discharge (especially if bloody) warrants a medical evaluation.
How to Tell What You’re Dealing With
A few quick questions can help you narrow it down:
- Are you breastfeeding? A white dot right on the nipple tip that hurts during nursing is most likely a milk bleb.
- Is the bump on the areola rather than the nipple itself? Multiple small, goosebump-like spots are almost certainly Montgomery glands.
- Is it a single, round, movable lump under the skin? That pattern fits a clogged pore or small cyst.
- Is there redness, flaking, or burning spreading across the nipple? Consider thrush or another infection, especially if you’re breastfeeding.
- Has the bump changed, grown, or developed discharge over several weeks? Get it evaluated by a healthcare provider.
Most white bumps on the nipple turn out to be part of normal anatomy or a minor, temporary blockage. A provider can diagnose most of these with a simple visual exam, so if you’re unsure or the bump hasn’t resolved in a few weeks, a quick check is the fastest way to put your mind at ease.