A stye is a small, painful bump on the eyelid caused by a bacterial infection in one of the tiny oil glands near your eyelashes. It looks similar to a pimple, usually fills with pus, and tends to heal on its own within one to two weeks. While styes can be annoying and uncomfortable, they’re rarely dangerous.
What Causes a Stye
Your eyelids contain dozens of small oil glands that help keep your eyes lubricated. When one of these glands gets clogged with dead skin cells, old oil, or debris, bacteria can multiply inside and trigger an infection. The bacterium responsible in most cases is Staphylococcus aureus, a common germ that normally lives on your skin without causing problems.
There are two types depending on which gland is affected. An external stye forms at the base of an eyelash, in one of the smaller oil glands along the lid margin. An internal stye develops deeper inside the eyelid, in one of the larger glands embedded in the lid itself. Internal styes tend to be more painful because they press against the eyeball, but both types follow the same basic pattern of infection, swelling, and eventual drainage.
What a Stye Looks and Feels Like
The first sign is usually tenderness or a gritty sensation on one part of your eyelid. Within a day or so, a red, swollen bump appears. It’s typically tender to the touch. Your eye may water more than usual, and the eyelid can feel heavy or puffy. Some people notice increased sensitivity to light.
As the stye matures over several days, you’ll often see a small white or yellowish head form at the center of the bump, much like a pimple coming to a head. At that point, the stye usually ruptures on its own, drains, and starts to heal. The whole process from first twinge to resolution typically takes one to two weeks.
How to Treat a Stye at Home
Warm compresses are the single most effective home treatment. Moisten a clean washcloth with warm water, wring it out, and hold it gently against the affected eye for about five minutes. Do this several times a day. The warmth helps loosen the clogged oil, encourages the stye to drain naturally, and relieves some of the pressure and pain. You can rewarm the cloth as it cools.
Beyond compresses, keep the area clean and resist the urge to squeeze or pop the stye. Squeezing can push the infection deeper into the eyelid or spread bacteria to surrounding glands. If you wear contact lenses, switch to glasses until the stye clears. Skip eye makeup during this time as well, since cosmetics can reintroduce bacteria or irritate the inflamed area.
When a Stye Needs Medical Treatment
Most styes resolve without any professional intervention. But if yours hasn’t improved after several days of warm compresses, or if it keeps coming back, your eye doctor may step in. The options depend on severity.
Topical antibiotic ointments applied to the eyelid are a common first step. Antibiotic eye drops are less useful for external styes because they coat the surface of the eyeball rather than the outer eyelid where the infection sits. For internal styes, drops may be more appropriate since the infection is closer to the eye’s surface.
Oral antibiotics are reserved for more serious situations: when the infection has spread beyond the gland, when the eyelid is severely swollen, or when you develop a fever alongside the stye. If a stye is particularly stubborn, your doctor can perform a small drainage procedure in the office to release the trapped pus, followed by antibiotics to prevent reinfection while it heals.
Stye vs. Chalazion
People often confuse styes with chalazia (the plural of chalazion), and the two can look similar at first glance. The key difference is that a stye is an active infection, while a chalazion is not. A chalazion forms when a blocked oil gland triggers an inflammatory reaction to the trapped oil rather than a bacterial infection. The result is a firm, usually painless lump in the eyelid that grows slowly over weeks.
The simplest way to tell them apart: styes hurt when you touch them, chalazia generally don’t. Styes also produce more redness and swelling in the surrounding skin. Sometimes a stye that doesn’t fully drain will leave behind a chalazion, so the two conditions can overlap. Chalazia often require different treatment, so it’s worth knowing which one you’re dealing with if the bump lingers.
Signs of a More Serious Problem
In rare cases, the infection from a stye can spread into the surrounding tissue of the eyelid, a condition called periorbital cellulitis. This causes redness and swelling that extends well beyond the original bump, sometimes across the entire eyelid or into the skin around the eye socket. Watch for these warning signs, which call for prompt medical care:
- Fever alongside eye pain and swelling
- Vision changes, such as blurriness or double vision
- Bulging of the eye forward from the socket
- Swelling spreading across the entire eyelid or to the other eye
These symptoms suggest the infection may be moving deeper, which requires antibiotics and sometimes hospital-based care. This progression is uncommon, but it’s the main reason a stye that’s getting worse rather than better deserves medical attention.
Preventing Styes
Since styes start with clogged oil glands and bacteria, prevention comes down to keeping your eyelids clean and minimizing the germ load around your eyes. Wash your hands before touching your face or eyes. At the end of each day, remove all eye makeup thoroughly using an oil-free remover or micellar water, followed by a gentle face wash. Never sleep in your makeup.
Eye cosmetics deserve special attention because they sit right at the eyelid margin where styes form. Replace mascara every three months, eyeliner every six months, and eyeshadow at least once a year. Wash brushes, sponges, and applicators with gentle soap and warm water at least once a week, and let them dry completely before using them again. Avoid lining the inner rim of your eyelid (the waterline) with eyeliner, since this can directly block oil gland openings. Don’t share eye makeup with others.
If you get styes repeatedly, your doctor may recommend a daily eyelid hygiene routine using pre-moistened lid scrub pads or diluted baby shampoo on a cotton swab to keep the gland openings clear. People with chronic eyelid inflammation (blepharitis) or skin conditions like rosacea are more prone to recurrent styes and may benefit from ongoing lid care as part of their daily routine.