Doctor's Notes on Chalazion (Lump in Eyelid)
A chalazion is a bump or lump in the upper or lower eyelid that arises due to inflammation of a gland of the lid known as a Meibomian gland. Other names for a chalazion include Meibomian cyst, tarsal cyst, or conjunctival granuloma. The cause of a chalazion is blockage of the thin opening through which a Meibomian gland of the eyelid secretes its material. The blockage can either be related to narrowing of the opening or hardening of the sebaceous fluid near the opening.
Associated symptoms and signs include a small bump on the eyelid that can be soft or firm. A chalazion is usually not painful. There may be fluid inside the lump. If the blocked gland becomes infected with bacteria, it may become tender to the touch. An infected chalazion is known as a hordeolum or sty.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.