A stye looks like a small, red, swollen bump on the edge of your eyelid, similar in appearance to a pimple. It typically develops a yellowish or whitish head of pus at its center as it matures, and the surrounding skin becomes puffy and tender to the touch. Most styes last one to two weeks and resolve on their own, but knowing exactly what to look for helps you tell a stye apart from other eyelid bumps that might need different treatment.
External Stye Appearance
The most common type of stye forms on the outside of your eyelid, right at the base of an eyelash. In its earliest stage, you’ll notice a small area of redness and tenderness along the lash line. Within a day or two, this spot develops into a raised, firm bump with a small yellowish pustule at the center, surrounded by swollen, reddened skin. It looks remarkably like a whitehead pimple that happens to be sitting on your eyelid.
The swelling can sometimes spread beyond the bump itself, making a larger portion of the eyelid look puffy. In some cases, the entire lid swells enough to partially obscure your vision. You may also notice watery eyes, crustiness along the lash line, or a gritty sensation when you blink. As the stye reaches its peak, the pus-filled head becomes more visible and pronounced before it eventually drains on its own.
Internal Stye Appearance
An internal stye develops on the inner surface of the eyelid, inside the tissue that faces your eyeball. Because it’s hidden, you won’t see a visible bump on the outside of your lid the way you would with an external stye. Instead, you’ll notice eyelid swelling and redness without an obvious pimple-like head on the outer surface.
If you gently flip or pull down your eyelid and look in a mirror, an internal stye appears as a small raised area or yellow spot on the inner lining of the lid. These tend to be more painful than external styes because they press against the eyeball when you blink. Over time, an internal stye can form a deeper pocket of pus, which may drain onto the inner surface of the eyelid rather than outward through the skin.
How a Stye Changes Over Time
A stye doesn’t appear fully formed. On day one, you might just feel a sore, slightly swollen spot along your eyelid margin. The area looks red and feels tender, but there’s no obvious bump yet. Over the next one to two days, the bump becomes more defined and firm, and the characteristic pus head starts to develop. Swelling peaks around this time, and the skin around the bump may look stretched and shiny.
After several days, the stye either drains spontaneously (you may wake up with dried discharge on your lashes) or gradually shrinks as your body reabsorbs the contents. The redness and swelling fade over the course of one to two weeks. Applying a warm compress for 10 to 15 minutes several times a day can speed this process by encouraging the blocked gland to open and drain.
Stye vs. Chalazion
People often confuse styes with chalazions because both create a bump on the eyelid, but they look and feel noticeably different. Here are the key distinctions:
- Location: A stye sits right at the eyelid margin, along or near the lash line. A chalazion forms farther back, in the body of the eyelid, away from the edge.
- Pain: A stye is painful and tender from the start. A chalazion may begin with mild soreness, but within a few days it becomes a firm, painless lump.
- Appearance: A stye is red and inflamed with a visible pus point. A chalazion is typically a round, hard nodule under the skin without redness or a yellowish head.
- Size over time: A stye stays relatively small and drains. A chalazion can slowly grow to the size of a pea or larger and persist for weeks or months.
A stye that doesn’t drain can sometimes turn into a chalazion. If your bump loses its tenderness but remains as a hard, painless lump after a couple of weeks, it has likely transitioned into a chalazion rather than a stye that’s still healing.
Warning Signs of Something More Serious
Most styes are harmless and self-limiting, but certain visual changes signal that the infection may be spreading. If redness and swelling extend beyond your eyelid to the skin around your eye, from your eyebrow down to your cheekbone, that’s no longer a simple stye. This pattern can indicate a deeper infection of the tissue surrounding the eye.
Other red flags include your eye bulging outward, pain when moving your eye in any direction, changes in your vision, or a fever alongside the swelling. In children especially, rapid swelling around the eye with a high fever warrants emergency care. Pus or blood leaking from the bump, or pain and swelling that haven’t started improving after 48 hours of warm compresses, also justify a visit to an eye care provider. These scenarios are uncommon, but catching them early makes a significant difference in treatment and recovery.