A stye looks like a small, red, pimple-like bump on the edge of your eyelid, usually centered around the base of an eyelash. It’s often swollen, tender to the touch, and may develop a visible yellowish head of pus within a day or two. Most styes are about the size of a pea or smaller, and the surrounding skin appears red or discolored with noticeable swelling.
What a Stye Looks Like Up Close
In its earliest stage, a stye doesn’t always look like much. You’ll notice redness and slight swelling at the edge of your eyelid, typically clustered around a single eyelash. The skin in that spot feels warm and sore before a defined bump is visible.
Within about a day, a small raised bump forms. It closely resembles a pimple or a boil, and it may fill with pus that gives it a yellowish-red appearance. The area around the bump becomes puffy, and you may notice your eye watering more than usual. Some people also get a crusty buildup along the lash line, especially after sleeping, from discharge that dries overnight.
The bump sits right at the lid margin, usually hugging the root of an eyelash. This is because the most common type of stye (called an external hordeolum) starts when bacteria infect the tiny oil gland that opens into the eyelash follicle. That’s why the redness fans out from a single lash rather than spreading evenly across the lid.
External vs. Internal Styes
Not all styes look the same, and the difference comes down to which oil gland is infected.
An external stye is the classic version most people picture. It forms a small yellowish pustule right at the base of an eyelash, surrounded by redness and swelling that can make the lid look puffy. You can see the bump clearly on the outer surface of the eyelid.
An internal stye develops deeper inside the lid, in the larger oil glands embedded in the eyelid’s cartilage. From the outside, you might only see general redness and swelling without an obvious pimple-like head. The bump is actually on the inner surface of the lid. If you gently flip the eyelid (or a doctor does), you’ll see a small raised area or yellow spot on the pink tissue underneath. Internal styes tend to be more painful relative to how little you can see on the outside, which can be confusing if you’re trying to figure out what’s going on.
How a Stye Changes Over Several Days
A stye typically develops over a predictable timeline. It starts with soreness and redness at the lid margin. Within about 24 hours, the bump appears and may become quite painful. Over the next few days, the pus collects into a visible white or yellow point at the surface.
After a few days, the bump usually pops on its own and drains. Once it drains, the pain drops quickly and the swelling starts going down. The whole process from first twinge to resolution generally takes about a week, sometimes a bit longer.
If you use a warm compress (a clean washcloth soaked in warm water, held against the closed eye for 10 to 15 minutes), don’t be alarmed if the bump temporarily looks bigger. The heat draws more fluid to the surface and encourages the stye to come to a head faster. This is normal and actually speeds up healing.
Stye vs. Chalazion
A chalazion is the bump most commonly confused with a stye, but the two look and feel noticeably different once you know what to check.
- Location: A stye sits right at the eyelid’s edge, near the lash line. A chalazion forms farther back on the lid, away from the lashes.
- Pain: A stye is very painful, especially when touched. A chalazion is usually painless or only mildly uncomfortable.
- Appearance: A stye looks like an angry, red pimple, often with a pus-filled head. A chalazion looks more like a firm, round, rubbery lump under the skin, without the redness or pustule.
- Speed: A stye comes on fast, over a day or two. A chalazion grows slowly over weeks and can linger for months.
Sometimes a stye that doesn’t fully drain turns into a chalazion. If your painful red bump gradually becomes a painless hard lump that sticks around, that transition is likely what happened.
When the Appearance Signals Something More Serious
Most styes are harmless and resolve on their own. But certain visual changes suggest the infection is spreading beyond the bump itself.
Watch for redness and swelling that extends well beyond the bump to involve the entire eyelid or the skin around your eye socket. Fever combined with significant eyelid swelling can indicate a deeper infection called preseptal cellulitis, where bacteria have spread into the soft tissue of the lid. The eyelid may become so swollen that it’s difficult to open, and the skin can feel hot and tight rather than just tender around a small spot.
More concerning signs include any change in your vision (blurriness, double vision), pain when moving your eye, or the eyeball itself appearing to push forward. These suggest the infection may have moved behind the eyelid into the eye socket, which requires prompt medical attention. In children, a feverish or generally unwell appearance alongside a swollen eye deserves quick evaluation.
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 examined. Recurrent styes in the same location occasionally need to be checked to rule out other causes of an eyelid bump.