A chalazion is a small, firm bump that forms in your eyelid when one of its oil glands becomes blocked. Unlike a stye, which is an acute infection, a chalazion is an inflammatory reaction to trapped oil. It typically starts with some redness, swelling, and tenderness, then settles into a painless lump that can stick around for weeks or months if untreated.
How a Chalazion Forms
Your eyelids contain dozens of tiny oil glands called meibomian glands, which line the inner rim and release an oily substance that keeps your tears from evaporating too quickly. A chalazion develops when the duct of one of these glands gets clogged, usually because the cells lining the duct thicken and block the opening. Oil backs up behind the blockage, the gland swells, and your immune system responds with a type of slow-burning inflammation called a lipogranuloma, where the body essentially walls off the trapped oil with a capsule of inflammatory tissue.
This is what gives a chalazion its characteristic firm, round feel. It’s not filled with pus like a pimple. It’s a contained pocket of thickened oil surrounded by immune cells. The gland itself can stretch and weaken over time if the blockage isn’t cleared, which is one reason chalazia sometimes recur in the same spot.
Chalazion vs. Stye
In the first day or two, a chalazion and a stye can look nearly identical: red, swollen, and sore. After that initial period, they diverge. A chalazion migrates toward the center of the eyelid and becomes a small, nontender nodule. A stye (hordeolum) stays at the eyelid margin, right at the lash line, and typically develops a visible yellowish head like a small pimple. Styes remain painful; chalazia usually stop hurting within a few days even though the lump persists.
One exception worth knowing: an internal hordeolum, which is an infection deeper inside the eyelid, can feel and look very similar to a chalazion. If your bump is painful, warm to the touch, and getting worse rather than settling down, it may be infected and worth getting checked.
Who Gets Chalazia
Some people get one chalazion and never deal with it again. Others develop them repeatedly. A large study of risk factors found that several conditions make chalazia more likely, particularly those that affect the skin around the eyes or the quality of the oil film on the eye’s surface. Blepharitis (chronic eyelid inflammation), rosacea, meibomian gland dysfunction, and seborrheic dermatitis all significantly raise the risk.
The same study found connections to inflammatory conditions that aren’t directly related to the eyes, including inflammatory bowel disease, gastritis, sarcoidosis, and Graves’ disease. Smoking was also a significant risk factor. Women and non-white individuals had higher rates of diagnosis, though it’s unclear how much of that reflects biology versus differences in who seeks care.
How Long They Last
About 25% of chalazia resolve entirely on their own, but that process takes an average of six months. With consistent warm compress treatment, the timeline shortens considerably. Research on conservative therapy found that chalazia present for two months or less responded best to treatment: 67% of lesions that fully resolved had been present for two months or less before treatment began. Lesions that had been hanging around longer than six months were significantly less likely to clear without a procedure.
The takeaway is straightforward: the sooner you start treating it, the better your odds of avoiding a procedure. Once a chalazion has been there for several months, the trapped material tends to harden and become less responsive to heat and massage.
Warm Compress Treatment
Warm compresses are the first-line treatment for nearly every chalazion. The goal is simple: soften the thickened oil plugging the gland so it can drain naturally. Stanford Health Care recommends applying a warm, wet compress for 5 to 10 minutes, 3 to 6 times a day. That’s a real time commitment, and consistency matters more than any single session.
A clean washcloth soaked in warm water works, but it loses heat quickly. Microwavable eye masks or rice-filled bags tend to hold temperature longer and make it easier to stick with the routine. After each session, gently massaging the bump toward the eyelid margin can help move the softened oil toward the opening of the gland. Avoid squeezing or trying to pop it, which can push the contents deeper into the tissue and make things worse.
When a Procedure Is Needed
If warm compresses haven’t worked after one to two months, there are two common next steps: a steroid injection into the bump or a minor surgical drainage.
Steroid injections work by calming the inflammatory capsule around the trapped oil, allowing the body to reabsorb the material. Reported success rates range from 62% to 92%, and complications are rare. The injection itself takes seconds and is done in an office setting. It tends to be a good option for people who want to avoid a cut, particularly for chalazia on the upper eyelid where a scar might be visible.
Incision and drainage is the more definitive option, with success rates of 87% to 89%. An eye doctor numbs the area with a local anesthetic, flips the eyelid, and makes a small cut on the inner surface so there’s no visible scar on the outside. The trapped material is scooped out, and the whole thing is over in minutes. You’ll likely have some swelling and bruising for a few days afterward. Fewer than one-third of patients experience a recurrence after surgical drainage, though people with underlying conditions like rosacea or blepharitis may be more prone to getting new ones in different glands.
When a Bump Isn’t a Chalazion
Rarely, what looks like a stubborn chalazion turns out to be something more serious. Sebaceous carcinoma, a cancer of the oil glands, can mimic a chalazion almost exactly. It’s uncommon, but it’s aggressive when it does occur. The red flags are a “chalazion” that doesn’t respond to any treatment, keeps coming back in the same location after being drained, or is accompanied by loss of eyelashes in that area. Any bump that persists despite treatment or recurs in the exact same spot deserves a biopsy to rule out malignancy.
Reducing Your Risk of Recurrence
If you’ve had one chalazion, keeping your eyelid glands healthy can help prevent the next one. A daily lid hygiene routine is the most practical step: after a warm shower or compress, gently clean along your lash line with diluted baby shampoo or a commercial lid scrub wipe. This removes the debris and flaky skin that can migrate into gland openings and start a new blockage.
If you have rosacea, blepharitis, or another condition linked to chalazia, managing that underlying issue is the most effective prevention. For people with meibomian gland dysfunction specifically, periodic warm compresses (even when you don’t have a bump) help keep the oil flowing and the glands from clogging.