A stye looks like a red, swollen bump on the edge of your eyelid, similar in appearance to a small pimple or boil. It typically forms right at the base of an eyelash and may develop a visible yellowish or white head as it fills with pus. The area around the bump is usually tender, warm, and noticeably redder than the surrounding skin.
External Stye Appearance
The most common type of stye, called an external stye, develops when a tiny oil gland at the root of an eyelash gets infected. Because the infection starts right at the lash follicle, the first thing you’ll notice is redness and swelling centered around a single eyelash. Early on, it may just look like a small, irritated spot. Within a day or two, it typically grows into a more defined, raised bump with a yellowish-red appearance at its center.
As the infection progresses, you may see a small white or yellow point at the tip of the bump, much like a pimple coming to a head. The surrounding eyelid often swells beyond just the bump itself. In some cases, the swelling spreads enough to puff up the entire eyelid, making it difficult to open your eye fully. The lump is painful to touch, and you may also notice your eye watering more than usual or a gritty, irritated sensation when you blink.
Internal Stye Appearance
An internal stye looks quite different because it forms inside the eyelid rather than on its outer edge. These develop when one of the larger oil glands embedded deeper in the eyelid tissue becomes infected or inflamed. Instead of seeing a bump near your lashes, you’ll notice a yellowish spot visible on the inner surface of your eyelid when you gently flip it. From the outside, the eyelid may appear swollen and red without an obvious raised bump.
Internal styes tend to be more painful than external ones because the infection presses against the inner lining of the eyelid, irritating the eye with every blink. They’re also harder to spot without pulling the eyelid away from the eye to look at the underside.
Stye vs. Chalazion
A chalazion is the bump most often confused with a stye, and the two can look similar at first glance. There are a few reliable ways to tell them apart.
- Pain: A stye is very painful, especially to the touch. A chalazion typically causes little to no pain.
- Location: A stye usually appears right at the eyelid’s edge near the lash line. A chalazion tends to develop farther back on the eyelid, away from the lashes.
- Swelling pattern: A stye often causes the entire eyelid to swell. A chalazion rarely makes the whole eyelid puffy; it stays more contained as a firm, round lump.
A chalazion forms when an oil gland gets blocked but not necessarily infected. The trapped oil causes a slow, painless enlargement. Styes, on the other hand, involve an active bacterial infection, which is why they’re red, hot, and tender. Sometimes a stye that doesn’t fully resolve can turn into a chalazion over time, leaving behind a hard, painless nodule after the initial infection clears.
How a Stye Changes Over Time
A stye doesn’t appear fully formed. It usually begins as a tender, slightly swollen spot on the eyelid that you might mistake for general eye irritation. Over the first day or two, the bump becomes more defined, turning redder and more raised. The yellow or white head, if one develops, usually appears within two to four days as pus collects at the surface.
Most styes drain on their own within a week or so. The bump may rupture, releasing a small amount of pus, and the swelling and pain drop off quickly after that. Warm compresses held against the eyelid for 10 to 15 minutes several times a day can speed this process by softening the blocked gland and encouraging drainage. Resist the urge to squeeze or pop a stye, as this can push the infection deeper into the eyelid tissue.
Signs That Something More Serious Is Happening
A straightforward stye stays localized. The redness and swelling are centered on the bump, even if the surrounding eyelid puffs up a bit. There are a few visual changes that suggest the infection is spreading beyond the original site.
If the redness and swelling extend well beyond the eyelid to the skin around your eye socket, this can signal a condition called preseptal cellulitis, where the infection has moved into the soft tissue surrounding the eye. The inflammation may become severe enough to force the eyelids tightly shut. Pain that worsens significantly, fever, or changes in your vision alongside spreading redness are signs that the infection needs prompt medical attention rather than home care.
A stye that hasn’t improved at all after two weeks, or one that keeps coming back in the same spot, is also worth having evaluated. Recurring styes sometimes point to an underlying issue with the oil glands along the eyelid margin that benefits from targeted treatment.