A stye looks like a small, red, pimple-like bump on the edge of your eyelid, usually right at the base of an eyelash. It’s typically 5 to 10 millimeters across (roughly the size of a pea or smaller) and often develops a visible yellow or white pus spot at its center as it matures. The surrounding skin appears swollen and red, and the bump is noticeably tender to touch.
External vs. Internal Styes
Most styes are external, meaning they form on the outside surface of your eyelid where your eyelashes grow. An external stye starts as a small, painful spot near a lash follicle and quickly develops into a yellowish pustule surrounded by redness and swelling. It’s easy to spot in a mirror because it sits right along the lash line.
An internal stye forms on the inner surface of the eyelid, so it’s harder to see without pulling the lid away from the eye. If you gently flip the eyelid, you’ll notice a small raised area or yellow spot on the inner tissue. Internal styes tend to cause the same pain and swelling as external ones, but the bump itself is hidden. The eyelid may look puffy and red on the outside even though you can’t see the actual lump without looking underneath.
How a Stye Changes Over Time
A stye doesn’t appear fully formed. In the first day or so, you’ll likely notice a tender, slightly red area along the eyelid margin. It may feel like a small, sore spot before any visible bump appears. Over the next day or two, the bump becomes more defined, growing into a firm, rounded lump with increasing redness around it. Swelling can spread beyond the bump itself, and in some cases your entire eyelid puffs up.
As the stye matures, a small pus spot often becomes visible at the center, giving it that classic pimple-like appearance. Most styes eventually drain on their own within a week or so, and the swelling gradually goes down after that. You may also notice crusting along the eyelid margin, watery eyes, and sensitivity to light during this process. A gritty, foreign-body sensation in the eye is common too.
Stye vs. Chalazion
A chalazion is the bump most often confused with a stye, and the visual differences are straightforward. A stye sits right at the eyelid’s edge near the lashes and is very painful. A chalazion usually develops farther back on the eyelid, away from the lash line, and is caused by a blocked oil gland rather than an infection. Chalazia are rarely painful and tend to grow more slowly.
The redness around a stye is typically more intense. Styes often make the entire eyelid swell, while a chalazion usually stays more localized as a firm, round bump. If you have a painless lump that’s been sitting on your eyelid for weeks without much redness, that’s more likely a chalazion than a stye.
Stye vs. Blepharitis
Blepharitis is generalized inflammation along the eyelid margins rather than a single bump. If your eyelids are red, swollen, itchy, and crusty along the entire lash line but there’s no distinct lump, that’s blepharitis. The key visual difference is that a stye always involves a localized, painful bump. Blepharitis affects a broader area and often involves both eyes, with flaky crusts collecting at the base of the eyelashes. The two conditions can overlap: chronic blepharitis actually increases your risk of developing styes.
Signs a Stye Needs Medical Attention
Most styes resolve without treatment, but certain visual changes signal something more serious. If redness and swelling spread beyond your eyelid to the skin around your eye, that can indicate a deeper infection called orbital cellulitis. This is especially concerning if the eye itself starts to bulge forward, you develop a fever, you have difficulty moving your eye, or your vision changes.
You should also get a stye checked if pus or blood leaks from the bump, your whole eyelid turns red, or the stye hasn’t improved after a week or two. In children, swelling that extends all the way around the eye with a high fever warrants an emergency room visit. These complications are uncommon, but they’re worth recognizing because they require prompt treatment.
Helping a Stye Heal
Warm compresses are the most effective home approach. Hold a clean, warm washcloth against the closed eyelid for 10 to 15 minutes, several times a day. The warmth helps the blocked gland open and drain naturally. Resist the urge to squeeze or pop a stye. Forcing it can push the infection deeper into the eyelid tissue and make things worse. Keep the area clean, avoid wearing eye makeup while the stye is active, and replace contact lenses with glasses until it resolves.