Chalazion (Lump in Eyelid)
A chalazion is a lump of the lid that is caused by obstruction of the drainage duct of an oil gland within the upper or lower eyelid. This lump may increase in size over days to weeks and may occasionally become red, warm, or painful.
The gland involved in the formation of a chalazion is a modified oil gland (meibomian gland) that lies within the eyelid. There are about 30-40 of these glands within each of the upper and lower lids. These glands secrete oil into the tears. When one of these glands becomes blocked, it can increase in size and cause a visible lump.
Although a stye is also a lump in the eyelid caused by obstruction of an oil gland, a chalazion is not a stye. A stye, or hordeolum, represents an acute infection of the gland. A chalazion is not an infection but is an inflammation of the area. Inflammation is a process in which the body reacts to a condition and produces swelling, redness, pain, or warmth. A stye is usually more painful than a chalazion and may appear infected.
Each of the oil glands, called Meibomian glands, produces oil which flows out of the gland into the tears. The oil exits from each gland through a tiny circular opening just behind the eyelashes of the upper and lower lids. A chalazion is caused by the oil in the gland becoming too thick to flow out of the gland or the opening of the gland being obstructed. Without anywhere to go, the oil builds up inside the gland and forms a lump in the eyelid. The gland wall may break, releasing the oil into the tissue of the eyelid, causing inflammation and sometimes scar tissue.
Medically Reviewed by a Doctor on 3/28/2014
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