A stye is a small, painful bump on the eyelid caused by a bacterial infection in one of the tiny oil glands or hair follicles along the lash line. Most styes last two to five days and heal on their own, though some can linger for a week or more. They’re one of the most common eyelid problems, and while they look alarming, they’re rarely serious.
What Causes a Stye
Your eyelids contain dozens of small oil glands that help lubricate the surface of your eye. When one of these glands gets clogged, its oily secretions stagnate and create a breeding ground for bacteria, most commonly Staphylococcus aureus, the same type of staph bacteria that causes many common skin infections. The bacteria multiply inside the blocked gland, triggering inflammation, and a tender red bump forms.
There are two types. An external stye develops at the base of an eyelash, in one of the small oil or sweat glands near the lash root. This is the kind most people picture: a visible, pimple-like bump right at the eyelid’s edge. An internal stye forms deeper in the eyelid, inside one of the larger oil glands embedded in the eyelid tissue. Internal styes tend to be more painful because they press against the eye itself, and they may not be visible from the outside at first.
Symptoms to Expect
The hallmark of a stye is pain. Unlike other eyelid bumps, a stye is distinctly tender and sore. It typically starts as a small, red, swollen area on the eyelid that’s sensitive to touch. Over a day or two, it usually develops a visible white or yellowish head, similar to a pimple. Your eye may water more than usual, and the eyelid can feel scratchy or irritated when you blink. In some cases, the swelling spreads to affect the entire eyelid.
Styes vs. Chalazia
People often confuse styes with chalazia (the plural of chalazion), but the two feel quite different. A stye is very painful, appears at the eyelid’s edge, and sometimes makes the whole eyelid swell. A chalazion is usually not painful. It forms as a firm bump farther back on the eyelid, away from the lash line, and is caused by a blocked oil gland without the active bacterial infection. A chalazion rarely causes the entire eyelid to swell the way a stye can.
Sometimes a stye that doesn’t fully drain will harden into a chalazion over time. If you have a painless bump that’s been sitting on your eyelid for weeks, it’s more likely a chalazion than a stye.
Who Gets Styes More Often
Anyone can get a stye, but certain factors make them more likely. Chronic eyelid inflammation (blepharitis) is one of the biggest risk factors, because the ongoing irritation keeps oil glands partially blocked. People with rosacea, a skin condition that causes facial redness and flushing, also appear to be more susceptible. Research has found that people who had styes during childhood had a significantly higher prevalence of rosacea as adults (5.5%) compared to those who didn’t (1.5%), suggesting a meaningful link between the two conditions.
Other common triggers include touching your eyes with unwashed hands, sleeping in contact lenses, and using old or contaminated eye makeup. Mascara should be replaced every six months, liquid eyeliner every six months, and pencil liners every one to two years. If you develop a stye or pink eye, toss your current eye products and start fresh.
How to Treat a Stye at Home
The most effective home treatment is a warm compress. Soak a clean washcloth in warm water, wring it out, and hold it gently against the affected eyelid for 5 to 10 minutes, 3 to 6 times a day. The warmth helps loosen the clogged oil, encourages the stye to drain naturally, and relieves pain. You can reheat or re-wet the cloth as it cools.
The American Academy of Ophthalmology recommends these conservative measures as the first-line treatment. Most uncomplicated styes resolve this way without any medication. A few important things to avoid: don’t squeeze or pop a stye the way you might a pimple. Squeezing can spread the infection deeper into the eyelid or into surrounding tissue. Avoid wearing contact lenses and eye makeup until the stye has healed completely.
When Antibiotics Are Needed
For most styes, antibiotics aren’t necessary. There’s actually little clinical evidence that topical antibiotics speed healing for a simple stye. That said, a doctor may prescribe an antibiotic ointment applied to the eyelid margin two to four times daily if there’s a secondary infection developing around the stye.
Oral antibiotics are a different story. They’re rarely needed for a straightforward stye but become important if the infection starts spreading into the surrounding skin, causing significant redness and swelling beyond the bump itself. This kind of spreading infection, called preseptal (periorbital) cellulitis, requires prompt treatment to keep the infection from reaching deeper tissues behind the eye.
When a Stye Becomes Serious
The vast majority of styes are harmless inconveniences. Rarely, the infection can spread beyond the eyelid into the deeper tissues of the eye socket, a condition called orbital cellulitis. This is a medical emergency. Warning signs include the eyeball itself pushing forward or appearing to bulge, pain when moving the eye, double vision, restricted eye movement, or any change in vision. These symptoms require urgent medical attention, as orbital cellulitis can threaten your eyesight if untreated.
A stye that doesn’t improve after a week of warm compresses, keeps growing larger, or starts affecting your vision also warrants a visit to an eye doctor. In these cases, a doctor can perform a small in-office procedure to drain the stye under local anesthesia, which provides quick relief.
Preventing Styes
Good eyelid hygiene is the most reliable way to reduce your risk. Wash your hands before touching your eyes or handling contact lenses. Clean your eyelids gently with warm water or a mild cleanser, especially if you’re prone to blepharitis. Remove all eye makeup before bed, and replace mascara and liquid liner every six months, even if you haven’t finished the tube. If you wear contact lenses, follow the recommended cleaning and replacement schedule rather than stretching their use.
For people who get recurrent styes, a daily warm compress routine of a few minutes each morning can help keep the oil glands flowing freely, even between flare-ups. If styes keep coming back despite good hygiene, it’s worth getting checked for underlying conditions like blepharitis or rosacea that may be driving the cycle.