A nipple that looks like it’s splitting, cracking, or developing a visible opening is almost always a sign of skin breakdown, not the nipple literally opening from within. The most common cause is a fissure, a small crack or cleft in the nipple skin that can look surprisingly deep. Up to 80% to 90% of breastfeeding women experience nipple fissures, but they also happen outside of breastfeeding due to friction, dryness, infection, or skin conditions.
Nipple Fissures During Breastfeeding
If you’re breastfeeding or recently stopped, a fissure is by far the most likely explanation. These are small wounds on the nipple surface that can appear as a cleft, a loss of skin, or a raw area with redness and swelling. Some fissures look like a slit running across the nipple tip, which can easily be mistaken for the nipple “opening up.”
The leading cause is an incorrect latch. When a baby doesn’t take enough of the breast into their mouth, the nipple gets compressed against the hard palate repeatedly, and the skin breaks down. Other contributing factors include unusually strong or weak infant sucking, a short frenulum (tongue tie) in the baby, and using pacifiers or bottles that change how the baby latches. Washing nipples with soap strips natural oils and makes the skin more vulnerable to cracking. Bacterial or yeast infections, particularly staph bacteria and candida, can also damage nipple skin or prevent existing cracks from healing.
Most breastfeeding-related fissures heal within a few days to a week once the underlying cause is addressed. Correcting the latch is the single most effective fix. Applying expressed breast milk to the area and letting it air dry can help, and keeping the skin moisturized between feedings prevents further cracking. If the fissure isn’t healing or shows signs of infection like pus, increasing redness, or warmth, that’s worth getting evaluated.
Dry Skin and Hormonal Changes
Outside of breastfeeding, nipple skin can crack and split from simple dryness or friction. Runners and athletes sometimes develop “jogger’s nipple” from repetitive rubbing against fabric. Cold, dry weather can also dry out the thin skin of the nipple enough to cause visible cracking.
Hormonal shifts play a real role too. After menopause, declining estrogen leads to thinner, drier skin across the body, and the nipple is no exception. The skin loses elasticity, becomes more fragile, and is more susceptible to small tears and slower healing. This means a crack that might have healed in a day or two at age 30 could linger for much longer at 55. Moisturizing the area regularly and avoiding harsh soaps can make a noticeable difference.
Eczema on the Nipple
Nipple eczema causes red, flaky, sometimes weeping skin that can look like the surface is breaking apart. It’s more common in people who have eczema elsewhere on their body, but it can appear on the nipple in isolation. The skin may feel itchy, raw, or tight, and scratching makes the breakdown worse.
What makes nipple eczema worth paying attention to is that it can look very similar to a rare form of breast cancer called Paget’s disease (more on that below). The key practical difference: eczema typically responds to moisturizers and topical treatments within a couple of weeks, and it often affects both nipples. A lesion that persists on one nipple despite treatment, or that keeps coming back, warrants a closer look.
Infection and Abscess
Sometimes what looks like the nipple opening up is actually a drainage tract forming from an infection underneath. Subareolar abscesses form when a milk duct near the nipple surface gets blocked. The duct lining can produce keratin that plugs it, and bacteria get trapped behind the blockage. The result is a painful, red, swollen area near the nipple that may eventually drain pus through the nipple or through the skin nearby.
Nipple piercings are a known risk factor for subareolar abscesses in people who aren’t breastfeeding. The piercing creates a direct pathway for bacteria to enter the duct system. Symptoms of a breast abscess include localized pain, warmth, swelling, and sometimes fever or nausea. If left untreated, a subareolar abscess can form a fistula, a permanent tunnel between the infected duct and the skin surface that keeps draining and reopening.
Piercing Migration and Rejection
If you have a nipple piercing and the skin around it seems to be splitting or thinning, your body may be rejecting the jewelry. During rejection, the body treats the piercing as a foreign object and gradually pushes it toward the surface. The entrance and exit holes get larger, and eventually the skin can crack open entirely.
Early signs include the jewelry sitting closer to the surface than when it was first placed, the bar or ring becoming more visible through the skin, and the holes looking wider or more elongated. If you notice these changes, removing the jewelry before the skin fully splits will result in less scarring than waiting for it to push through on its own.
Duct Ectasia
Mammary duct ectasia is a condition where the milk ducts behind the nipple widen and their walls weaken. It happens most often in women approaching or past menopause. The duct walls lose their structural protein and become dilated, which can trigger inflammation and scarring in the tissue around the nipple.
Over time, this scarring can pull on the nipple, causing it to retract, flatten, or appear distorted. Some people notice discharge, which can be thick, sticky, or greenish. In severe or repeated cases, the fibrosis in the nipple area can change the shape of the nipple noticeably. Duct ectasia is benign, but because the nipple changes it causes (retraction, distortion, discharge) can overlap with signs of breast cancer, imaging is typically recommended to confirm the diagnosis.
When Nipple Changes Need Evaluation
Most nipple cracking and splitting has a straightforward, treatable cause. But certain patterns are important to take seriously. A persistent change on only one nipple is more concerning than changes on both. Paget’s disease of the breast, a rare cancer, typically affects a single nipple and causes scaly, crusty, or oozing skin that looks like eczema but doesn’t respond to eczema treatments. It may also cause the skin to harden or thicken over time.
The practical rule of thumb: if a nipple skin change hasn’t improved after two to three weeks of basic care (moisturizing, avoiding irritants, treating for eczema), or if it’s only on one side, a biopsy is the definitive way to rule out Paget’s disease or other causes. Any bloody or clear fluid draining spontaneously from a single duct also warrants imaging, typically a mammogram and ultrasound as a first step.
Nipple changes that come with a new lump behind the nipple, sudden nipple inversion that wasn’t there before, or skin that looks pitted or dimpled around the areola should be evaluated promptly regardless of how long they’ve been present.