A new bump on your eyelid can be uncomfortable and worrying. Two common causes are a stye and a chalazion. They can look similar, but they usually develop for different reasons: a stye is typically an infection near an eyelash or eyelid gland, while a chalazion forms when an oil gland becomes blocked. Pain, location, and how the lump develops can offer clues, but they cannot confirm the cause on their own.

This guide explains the main differences, safe steps you can take at home, what to avoid, and when to contact an eye-care professional. It is general educational information, not a diagnosis. If symptoms are severe, getting worse, or affecting your vision, seek professional care rather than relying on an online comparison.

Stye vs chalazion: at-a-glance symptom comparison

Feature	Stye	Chalazion
Main cause	Usually a localized bacterial infection involving an eyelash follicle or nearby gland.	A blocked oil-producing meibomian gland in the eyelid.
Pain	Often tender or painful, especially at the eyelid edge.	Usually painless or mildly tender; it can become inflamed.
Typical position	Often near the base of the eyelashes; can also form on the inner eyelid.	Often farther back in the eyelid, away from the lash line.
Appearance	Red, swollen bump that may have a small yellow point.	Firm or rounded lump that may develop gradually.
Other symptoms	Tenderness, watering, crusting, or a feeling of irritation.	A persistent lump; a large one may press on the eye and blur vision.
Typical course	Often starts improving over several days, though healing may take longer.	May take weeks to settle and can persist without treatment.
Contagious?	The bump itself is not usually described as highly contagious, but bacteria can spread through contaminated hands or items.	Not generally contagious; it is usually caused by a blocked gland rather than an infection.

These are common patterns, not strict rules. A stye can be deeper inside the eyelid, and a chalazion can become red or tender. Other eyelid conditions can also cause swelling or lumps. If you are unsure what you are seeing, an examination is the safest way to clarify it.

What is a stye?

A stye, also spelled “sty” and medically called a hordeolum, is a small, localized infection involving a gland or hair follicle in the eyelid. It often looks like a pimple close to the eyelashes and can be sore to the touch. The eyelid may look red or swollen, and the eye may water or feel scratchy. Some styes form on the outer edge of the lid; others develop on the inner surface.

Styes are commonly associated with bacteria that normally live on the skin. Touching the eyes with unwashed hands, using contaminated contact lenses, leaving eye makeup on overnight, or using old eye cosmetics can increase the chance of problems. Ongoing eyelid inflammation, such as blepharitis, may also make styes more likely to recur.

For symptoms, causes, and care guidance, see the Mayo Clinic’s stye overview. Most uncomplicated styes improve with simple care, but worsening symptoms or spreading redness should not be ignored.

What is a chalazion?

A chalazion develops when one of the tiny oil glands in the eyelid becomes blocked. These glands help produce the oily layer of tears that slows evaporation. When oil cannot drain normally, it can collect and trigger inflammation, creating a lump in the eyelid.

Unlike a typical stye, a chalazion is often not very painful. It may start as mild swelling and gradually become a firmer, more noticeable bump. It can occur on either the upper or lower eyelid. A large chalazion may press against the front of the eye and cause temporary blurry vision or discomfort, so size and effect on vision matter even if the lump does not hurt.

A chalazion is not usually caused by an active bacterial infection. However, a stye and chalazion can overlap: inflammation from an earlier stye may leave a blocked gland behind, and an irritated chalazion can become tender. A persistent or repeatedly recurring lump deserves an eye-care assessment.

Why these bumps can look similar

Both conditions affect the eyelid and can cause a visible lump, swelling, and redness. Their appearance can also change over time. A stye may become less painful as it settles, while a chalazion may become red or sore when inflamed. That is why pain alone—or a photograph alone—cannot reliably tell you what is happening.

A clinician may examine the eyelid, ask when the lump started, check for tenderness and discharge, and assess whether vision or the surface of the eye is affected. Repeated lumps in the same place, an unusual appearance, or a lump that does not resolve may need further evaluation to rule out other causes. Avoid assuming that every eyelid bump is a stye or chalazion.

Safe care to discuss with a clinician

Use a comfortably warm compress

A clean, warm—not hot—washcloth held gently over the closed eyelid can help relieve discomfort. Many eye-care resources recommend applying a warm compress for about 5–10 minutes at a time, several times a day. Re-warm the cloth as needed, and test the temperature on your wrist first to avoid burns. Use a clean cloth each time and do not press hard on the eye.

Warm compresses can help a stye drain naturally and may soften the blocked oil in a chalazion. They do not guarantee that a lump will disappear, and persistent symptoms may need professional treatment. For more detailed self-care guidance, read the Mayo Clinic’s stye treatment guidance.

Keep the eyelid clean and avoid irritation

Wash your hands before and after touching the area around your eye. Gently clean the eyelid without scrubbing, rubbing, or getting irritating products into the eye. Avoid eye makeup while the area is inflamed, and do not share towels, washcloths, or eye cosmetics. If you use contact lenses, pause wearing them while the eyelid is irritated and follow advice from your eye-care professional about when it is safe to restart.

Do not put household substances, essential oils, or non-sterile products near the eye. Do not use leftover antibiotic drops or ointments unless a clinician tells you to: the right treatment depends on what is causing the symptoms.

What not to squeeze or attempt yourself

Do not pop, pierce, cut, or squeeze an eyelid bump. Trying to force it to drain can worsen inflammation, injure delicate eyelid tissue, or spread infection. Do not attempt to remove an eyelash or insert a needle. If a stye or chalazion needs drainage, a trained clinician can decide whether a procedure is appropriate and perform it safely.

Antibiotics are not automatically needed for every lump. A chalazion is generally a blocked-gland problem, so antibiotics may not help unless a clinician identifies an associated infection or another reason to prescribe them. Likewise, a persistent stye may require assessment before treatment is selected. Do not start prescription medication based only on a web article.

When to call an eye-care professional

Arrange an examination if the lump is not beginning to improve, keeps returning, becomes increasingly painful, or remains for several weeks. Also seek advice if swelling or redness spreads across the eyelid or into nearby facial skin, if discharge is substantial, or if the bump interferes with normal eyelid movement. A clinician can confirm the likely cause and explain whether continued home care, medication, or a procedure is appropriate.

If you are in Scottsdale, Arizona, you can review the eye-care services offered by Lumiere Optique and use the appointment request page to ask about an appropriate assessment. The practice should confirm which clinician and services are available for your specific concern. Do not delay urgent care to wait for a routine appointment.

When symptoms require urgent attention

Seek prompt, same-day medical advice if you have significant or rapidly increasing pain, marked swelling, redness spreading beyond the eyelid, fever, or symptoms that suggest the infection may be spreading. Get urgent assessment if your vision changes, the eye itself becomes very painful, you have pronounced sensitivity to light, or you cannot comfortably open the eye. A swollen eyelid that closes the eye, especially with pain or vision changes, should not be managed at home alone.

Vision changes can have causes other than a stye or chalazion. If you have sudden vision loss or severe eye pain, seek emergency medical care. When in doubt about the seriousness of symptoms, choose prompt professional assessment.

Frequently asked questions

Can a stye turn into a chalazion?

A stye and a chalazion are different conditions, but they can be related. Inflammation around a stye may leave an oil gland blocked, and a chalazion can develop afterward. A clinician can help determine what type of lump remains if it does not settle.

Will a chalazion go away on its own?

Many chalazia gradually improve over several weeks, and warm compresses may help. Some persist or recur and may need treatment. Arrange an examination if the lump is growing, affecting vision, repeatedly returning, or not improving.

Is a chalazion painful?

A chalazion is often painless or only mildly tender. It may become red or sore if inflamed. Strong pain, rapidly worsening swelling, or changes in vision are reasons to seek professional advice rather than assuming it is a routine chalazion.

Is a stye contagious?

A stye is usually a localized infection and is not typically spread through ordinary casual contact. However, bacteria can transfer through hands, shared towels, or contaminated cosmetics. Wash your hands, avoid sharing personal items, and keep the eyelid clean.

Is it safe to wear makeup or contact lenses?

It is generally best to avoid eye makeup and contact lenses while a stye or irritated eyelid bump is healing. Makeup can irritate the area, and contact lenses or lens-handling practices may contribute to contamination. Follow your eye-care professional’s instructions before resuming use, and replace eye makeup that may be contaminated.

What if my eyelid swells shut?

If swelling is severe enough that you cannot open the eye normally, seek prompt medical assessment—especially if you also have pain, fever, spreading redness, or vision changes. Do not force the eyelid open or try to drain the lump yourself.

When is referral or a procedure needed?

A clinician may recommend referral to an ophthalmologist or another appropriate eye-care professional if the lump is persistent, large, recurrent, unusual, or affecting vision. Some chalazia or styes need a procedure when they do not resolve, but the decision depends on the examination and your individual circumstances.

The bottom line

The simplest clue is often pain: a stye is usually a tender, sometimes red bump near the lash line, while a chalazion is more often a firm, less painful lump caused by a blocked oil gland. But the two can look alike and symptoms can overlap. Use a clean warm compress, keep the area clean, avoid makeup and contact lenses while irritated, and never squeeze or pierce the bump.

Seek professional care if symptoms persist, worsen, recur, spread, or affect vision. Severe pain, fever, spreading swelling, or vision changes call for prompt assessment. An eye-care professional can confirm what is causing the eyelid lump and recommend the safest next step.