What Causes Styes Inside The Eyelid?

A stye inside the eyelid forms when one of the small oil-producing glands along the inner rim of the eyelid becomes blocked and infected. The most common cause is bacteria — usually Staphylococcus aureus — that normally live on the skin and get trapped in the gland. The result is a tender, red, swollen bump that can feel like a small pebble under the lid.

There are two main types. An internal hordeolum forms in the meibomian glands, which sit deeper in the eyelid and release oil onto the eye’s surface. An external hordeolum forms at the base of an eyelash in the glands of Zeis or Moll. Both are styes, but they sit in different places and behave a little differently.

What Causes Styes Inside the Eyelid?

The direct cause is a blocked gland plus bacterial growth inside it. The meibomian glands line the inner edge of both eyelids and secrete oils that keep your tear film stable. When one of those ducts clogs, oil backs up, and bacteria that already live on your skin multiply in the trapped material. That triggers inflammation and the swollen, painful bump you feel.

Several things make this more likely:

• Touching or rubbing your eyes with unwashed hands, which transfers bacteria
• Eye makeup that is old, shared, or not fully removed at night
• Contact lenses worn longer than recommended or not cleaned properly
• Prior styes or a history of blepharitis, a chronic inflammation of the eyelid margin
• Skin conditions such as rosacea, which is linked to meibomian gland problems
• Conditions that affect oil gland function, including diabetes

One point worth clarifying: a stye is not caused by “bad hygiene” in any moral sense. The bacteria involved are normal skin residents. The problem is a blocked duct, not a dirty face. That distinction matters because it changes how you think about prevention.

How Is a Stye Inside the Eyelid Different From a Stye on the Outside?

Location is the whole difference. An external stye sits at the edge of the eyelid on the lash line. You can usually see it as a small red bump with a white or yellow center, and it may point outward.

An internal stye sits deeper, on the inner surface of the lid. It often looks like a red or gray area when you pull the lid down, and it can feel larger and more painful than it looks from the outside. Because it is buried in the gland, it may take longer to come to a head — and it may not come to a head at all.

Both types are caused by the same basic problem: a blocked gland and bacterial overgrowth. The internal version involves the meibomian glands rather than the lash-line glands.

Is a Stye Inside the Eyelid the Same as a Chalazion?

No, and this is one of the most common mix-ups. They look similar and start the same way, but they are different conditions.

A stye (hordeolum) is an active infection. It is typically tender, red, and painful. A chalazion is a blocked gland that has become a firm, painless lump — sometimes called a lipogranuloma. It happens when oil leaks into surrounding tissue and triggers a chronic inflammatory response rather than an acute infection.

In practice, the two overlap. A stye can resolve into a chalazion. A chalazion can become infected and turn into a stye. If a bump on your eyelid is painless and has been there for weeks, a chalazion is more likely. If it is tender and appeared recently, a stye is more likely. A doctor can usually tell the difference on examination, but not always — and treatment for each is different enough that the distinction matters.

What Are the Symptoms of a Stye Inside the Eyelid?

The most common symptoms are tenderness, a feeling of something in the eye, and a visible or felt bump on the inner lid. Many people also notice redness, swelling, and increased tear production on that side.

Other symptoms can include:

• A gritty or scratchy sensation when blinking
• Light sensitivity on the affected side
• A small amount of discharge or crusting along the lash line
• Blurred vision if the swelling presses on the eye surface — this usually clears when the stye resolves

Most styes are uncomfortable but not dangerous. There is one important exception: if you have swelling that spreads beyond the eyelid, fever, or vision changes that do not go away, that is a reason to seek medical care promptly rather than waiting. Infection can, in rare cases, spread into the tissue around the eye.

What Helps a Stye Inside the Eyelid Heal?

Warm compresses are the mainstay of at-home care. A clean washcloth soaked in warm — not hot — water, held against the closed lid for several minutes at a time, several times a day, can help soften the blocked oil and encourage drainage. This is widely recommended by clinicians. The evidence base for it is largely based on longstanding clinical practice rather than large trials, but it is low-risk and generally considered the first step.

Keep your hands away from the stye. Do not squeeze, pop, or try to drain it. The eyelid is thin tissue close to the eye, and squeezing can push infection deeper.

If you wear contact lenses, stop wearing them on the affected eye until the stye is fully gone. If you wear eye makeup, skip it on that eye and throw away anything you used recently — bacteria can live in mascara and eyeliner and reinfect the lid.

For styes that do not improve on their own, a doctor may recommend prescription antibiotic ointment or, in some cases, an oral antibiotic. For a persistent chalazion, options include steroid injection or a minor procedure to drain it. These are clinical decisions, not something to manage yourself.

When Should You See a Doctor for a Stye?

See a doctor if the stye has not improved after about a week of warm compresses, if it gets worse instead of better, or if it grows large enough to affect your vision. Also seek care if you have recurring styes, since that can point to an underlying issue like blepharitis or rosacea that needs its own treatment.

Get medical attention the same day if you notice any of the following:

• Swelling or redness spreading to the cheek, forehead, or around the eye
• Fever or chills
• Vision loss or double vision that does not resolve
• Severe pain, especially pain with eye movement
• A stye in someone with a weakened immune system or diabetes

These signs can indicate that infection has moved beyond the gland into surrounding tissue, which needs prompt treatment.

Can You Prevent Styes Inside the Eyelid?

You cannot prevent every stye, because the bacteria involved are normal skin residents. But you can reduce how often blocked glands become infected.

Practical steps include washing your hands before touching your face or eyes, removing eye makeup completely every night, replacing mascara every few months, and cleaning contact lenses exactly as directed. If you have blepharitis, keeping the eyelid margins clean — often with warm compresses and lid scrubs recommended by your eye doctor — may reduce recurrence.

For people with rosacea or chronic meibomian gland dysfunction, managing the underlying condition is often the most effective way to reduce how often styes come back. That is a conversation to have with a doctor or eye specialist, not something to self-treat.