A stye is a painful, red bump on the eyelid caused by a bacterial infection in one of the small oil-producing glands near your eyelashes. It looks similar to a pimple, is tender to the touch, and typically resolves on its own within one to two weeks. Styes are extremely common and rarely serious, but they can be uncomfortable and sometimes need medical attention.
How a Stye Forms
Your eyelids contain dozens of tiny glands that produce oils to keep your eyes lubricated. When one of these glands gets blocked, bacteria (most commonly Staphylococcus aureus, the same germ behind many skin infections) can multiply inside, triggering an infection. The result is a swollen, painful bump right at the eyelid margin.
There are two types. An external stye forms at the base of an eyelash, in one of the small oil or sweat glands along the lid’s outer edge. An internal stye develops deeper inside the eyelid, in one of the larger oil glands embedded in the lid itself. External styes are more common and easier to spot. Internal styes tend to be more painful because they press against the eyeball, and you may only notice them by flipping the eyelid or feeling a deep ache when you blink.
What It Looks and Feels Like
In the earliest stage, you’ll notice mild redness, tenderness, and slight swelling along the eyelid margin. It can feel like something is irritating your eye. Over the next day or two, the bump becomes more defined: redder, more swollen, and increasingly tender. A small pus-filled head may appear at the center, much like a whitehead. Your eye may water more than usual, and you might feel a gritty sensation or mild pain that worsens with blinking.
Most styes stay localized to a single spot on one eyelid. If your entire eyelid becomes swollen, or if redness and warmth spread well beyond the bump itself, that’s a sign the infection may be moving beyond the gland.
Stye vs. Chalazion
People often confuse styes with chalazia (the plural of chalazion), but the two feel quite different. A stye is very painful and usually sits right at the eyelid’s edge, rooted in an infected eyelash follicle. A chalazion is typically not painful. It forms farther back on the eyelid, where a blocked oil gland has caused a firm, round lump without an active bacterial infection. Think of it this way: a stye is an infected pimple, while a chalazion is more like a cyst.
Sometimes a stye that doesn’t fully drain will leave behind a chalazion. If a painless lump persists on your eyelid for weeks after the initial tenderness fades, that’s likely what happened.
What Raises Your Risk
Anything that increases bacteria around your eyes or clogs the oil glands in your eyelids makes styes more likely. The most common risk factors include:
- Blepharitis: chronic inflammation along the eyelid margins, which keeps oil glands irritated and prone to blockage
- Rosacea: a skin condition that frequently involves the eyelids and disrupts normal oil gland function
- Old or shared eye makeup: bacteria grow easily in creamy or liquid cosmetics, especially after three months of use
- Touching your eyes with unwashed hands: the simplest and most common way to introduce bacteria
- Leaving eye makeup on overnight: residue along the lash line blocks gland openings
- Previous styes: once you’ve had one, recurrence is more likely, particularly if an underlying condition like blepharitis isn’t managed
Home Treatment
Warm compresses are the single most effective home treatment. Soak a clean washcloth in warm (not hot) water, wring it out, and hold it gently against the closed eyelid for 10 to 15 minutes. Repeat this three to four times a day. The warmth helps soften the blocked oil, encourages the gland to open, and draws the infection toward the surface so it can drain naturally. You’ll often notice improvement within a few days.
Resist the urge to squeeze or pop a stye. Squeezing can push the infection deeper into the eyelid or spread bacteria to surrounding glands. Let it drain on its own. While you’re waiting, avoid wearing contact lenses and eye makeup, both of which can reintroduce bacteria or irritate the area further.
If a stye isn’t improving after a week of consistent warm compresses, or if it’s getting noticeably worse, a doctor may prescribe antibiotic ointment or drops to help clear the infection. For larger styes that have formed a significant abscess, a doctor can lance (pierce) the bump under local anesthesia to let it drain. This is a quick in-office procedure and provides fast relief.
When a Stye Becomes Something More Serious
The vast majority of styes are harmless. In rare cases, though, the infection can spread from the gland into the soft tissue around the eye, a condition called periorbital (preseptal) cellulitis. Warning signs include swelling that spreads across the entire eyelid, significant redness extending to the skin around the eye, and fever.
Even rarer but more urgent is orbital cellulitis, where infection pushes deeper behind the eye. The distinguishing symptoms are the eye bulging forward, pain when moving the eye, double vision, or decreased vision. These symptoms require immediate medical attention because untreated orbital cellulitis can threaten eyesight and, in severe cases, become life-threatening.
Keeping Styes From Coming Back
If you’re prone to styes, daily eyelid hygiene makes a real difference. Washing your eyelids with diluted baby shampoo, which ophthalmologists frequently recommend as a gentle, tear-free cleanser, helps keep the oil glands clear and reduces bacterial buildup along the lash line. Use a clean cotton swab to gently scrub along the base of your eyelashes after removing makeup.
Replace eye makeup every three months. Infection-causing bacteria thrive in liquid and cream cosmetics, and mascara tubes are particularly hospitable environments. If you develop any eye infection, throw out all your current eye makeup immediately and don’t use new products until the infection has fully resolved. Never share eye makeup or applicators with others.
Washing your hands before touching your face, removing contact lenses with clean fingers, and treating underlying eyelid conditions like blepharitis or rosacea all reduce the likelihood of recurrence. For people who get styes repeatedly, a doctor may recommend ongoing warm compress routines or medicated eyelid wipes as part of a daily prevention strategy.