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Chalazion |
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A chalazion is caused by noninfectious occlusion of a meibomian gland. Irritating lipid material is extravasated into eyelid soft tissues, causing a focal inflammatory response. In its initial stages, a chalazion is clinically indistinguishable from a hordeolum.
Image courtesy of Jonathan J. Dutton via the Online Journal of Ophthalmology (www.onjoph.com).