The area around the nipple is called the areola (pronounced uh-REE-oh-luh). It’s the circle of darker skin that surrounds the nipple, and together these two structures are known in medicine as the nipple-areola complex, or NAC. While the name is straightforward, the areola itself is more complex than it looks, with specialized glands, a dense network of nerves, and a size and color that naturally vary from person to person.
What the Areola Looks Like
The areola ranges widely in size. In adult women, the average diameter is about 40 mm (roughly 1.5 inches), while in men it averages around 27 mm. These are just midpoints. Male areola diameter can range from about 10 mm to 43 mm, and female areolas vary even more depending on age, body composition, genetics, and hormonal changes like pregnancy or puberty.
Color ranges from pale pink to dark brown, and it’s common for the areola to be several shades darker than the surrounding breast skin. You may also notice small bumps scattered across the surface. These are the openings of specialized glands, and they’re completely normal.
Montgomery Glands: The Small Bumps
Those bumps on the areola are called Montgomery glands (sometimes Montgomery tubercles). They release an oily substance similar to the natural oils your skin produces elsewhere, but tailored specifically for this area. This secretion does several things at once: it lubricates and protects the delicate areola skin, maintains an acidic pH that discourages bacteria and yeast from overgrowing, and produces a scent that helps newborns find the nipple and latch on during breastfeeding.
Montgomery glands also connect to the mammary glands beneath them and can release small amounts of milk. Some researchers believe they may function as backup milk-producing glands when a baby needs more. The number of visible bumps varies from person to person, and they tend to become more prominent during pregnancy and breastfeeding.
Why the Areola Exists
The areola’s primary biological role is tied to breastfeeding. Its darker pigmentation creates a visual contrast against the surrounding skin, making it easier for a newborn with undeveloped vision to locate the nipple. During pregnancy, the areola often grows larger and darker for exactly this reason.
The scent function matters just as much. The chemical compounds released by Montgomery glands act as olfactory signals for newborns. Research published in The Lancet’s eBioMedicine describes these glands as a source of active chemical compounds for scent communication, combining tiny milk-producing structures with oil glands that help transmit smell. Colostrum, the first milk produced after birth, appears to be especially attractive to two-day-old newborns compared to mature milk, likely because it contains volatile compounds that help initiate breastfeeding.
Nerve Supply and Sensitivity
The areola is one of the more sensitive areas of the body, thanks to a dense web of nerves running just beneath the skin’s surface. Branches from several intercostal nerves (the nerves that run between the ribs) travel through the tissue and form a nerve network, called a plexus, directly under the areola. The nerves reach the nipple by passing through the tissue of the areola itself.
Interestingly, the exact nerve contribution varies not just from person to person but even between the left and right sides of the same individual. This explains why one side can feel noticeably more or less sensitive than the other. Stimulation of these nerves during breastfeeding triggers the release of hormones that support milk production and flow.
Changes During Pregnancy
Breast changes are among the earliest signs of pregnancy, sometimes appearing as early as the fifth or sixth week. The areola typically becomes larger in diameter and darker in color as pregnancy progresses. These shifts are driven by hormonal changes and serve a practical purpose: the increased contrast between the areola and surrounding skin helps a newborn with limited eyesight locate the nipple more easily.
Montgomery glands also become more visible and active during pregnancy, producing more of their protective lubricant in preparation for breastfeeding. After pregnancy and breastfeeding end, the areola often lightens somewhat but may not return to its original size or shade.
Hair Growth on the Areola
Finding hair growing around or on the areola is extremely common and almost never a sign of a medical problem. Hair follicles naturally exist in areola skin, and hormonal fluctuations during puberty, menstruation, pregnancy, or aging can trigger visible growth. The hairs are often dark and wiry, which can make them more noticeable, but they’re a normal variation. If the hair bothers you, it can be safely trimmed or carefully plucked.
Skin Changes Worth Watching
Most areola variations are harmless, but certain skin changes warrant attention. Paget’s disease of the breast is a rare form of cancer that typically starts at the nipple and can spread to the areola. It often mimics eczema, which can delay diagnosis. Signs to be aware of include flaky or scaly skin on the nipple, crusty or oozing patches that look like a rash, persistent itching or burning, straw-colored or bloody discharge, a newly inverted nipple, or a lump in the breast. These symptoms almost always appear on one side only. Any persistent skin change on the nipple or areola that doesn’t respond to standard skin care is worth getting evaluated.