Chalazion (also known Meibomian cyst) is a cyst in the eyelid due to a blocked oil gland. They are typically in the middle of the eyelid, red, and not painful. They tend to come on gradually over a few weeks.A chalazion may occur following a stye or from hardened oils blocking the gland. The blocked gland is usually the meibomian gland but can also be the gland of Zeis. A stye and cellulitis may appear similar. A stye, however, is usually more sudden in onset, painful, and occurs at the edge of the ...
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