Tags: Disease.
A chalazion (/kəˈleɪziən/; plural chalazia /kəˈleɪziə/) also known as a meibomian gland lipogranuloma is a cyst in the eyelid that is caused by inflammation of a blocked meibomian gland usually on the upper eyelid. Chalazia differ from styes (hordeola) in that they are subacute and usually painless nodules. They may become acutely inflamed but unlike a stye chalazia usually point inside the lid rather than on the lid margin.
