Condition
Chalazion
Clinically reviewed · Last reviewed 2026-06-13
What it is
A chalazion is a firm lump that forms in the eyelid when one of the small oil glands becomes blocked. It is usually painless, although it can start as a tender swelling. It is harmless but can take several weeks to clear.
Common symptoms
A chalazion usually affects one eyelid.
- A firm, usually painless lump in the eyelid
- Mild swelling or redness when it first appears
- A lump that grows slowly over days to weeks
- Occasionally blurred vision if it is large and presses on the eye
Causes and risk factors
A chalazion is caused by a blocked oil (meibomian) gland in the eyelid. It is more common in people who have blepharitis or skin conditions such as rosacea.
Treatment and self-care
Warm compresses held against the eyelid for 5 to 10 minutes several times a day, followed by gentle massage, help the blockage clear. Most settle without further treatment. A persistent or large chalazion may need a minor procedure or injection, so see a clinician if it does not improve.
Frequently asked questions
What is the difference between a chalazion and a stye?
A stye is usually a painful, infected lump at the lash line, while a chalazion is a usually painless lump further from the edge caused by a blocked oil gland. A stye can sometimes turn into a chalazion.
How long does a chalazion take to go away?
Many clear within a few weeks with warm compresses, but some take longer. A lump that persists may need to be assessed by a clinician.
Should I squeeze a chalazion?
No. Squeezing can cause damage or infection. Use warm compresses and gentle massage instead, and seek advice if it does not settle.