What is a chalazion?
Chalazion, or internal hordeolum (stye), is a localised chronic inflammation of the eyelid due to a blocked meibomian (oil) gland. This type of disorder is commonly associated with rosacea and posterior blepharitis (inflammation of the inner back side of the eyelid). In case of unilateral blepharitis and recurrent chalazia in the same location, meibomian gland carcinoma is suspected. The excised lesion is therefore always examined histologically.