A chalazion is a lump in the upper or lower eyelid caused by inflammation of a gland of the lid. The swelling or lump may be soft or firm. Fluid may be present within the lump. A chalazion is very common and usually goes away on its own without any special treatment. A chalazion does not cause vision problems unless the lump is so large that it distorts the surface of the eye, but this is rare. Pain is usually not present. A chalazion is also known as a meibomian cyst, tarsal cyst, or conjunctival granuloma.
Causes of a chalazion
A chalazion is caused by clogging of the narrow opening through which a meibomian gland of the eyelid secretes its material. This can be due to narrowing of the opening or hardening of the sebaceous liquid near the opening.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.
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