hordeolum (MONDO_0005800, a Monarch Disease Ontology id) is an acute, localized swelling of the eyelid that may be external or internal and usually is a pyogenic (typically staphylococcal) infection or abscess. Also known as: Stye, blepharitis of eyelid gland, boil of eyelid, eyelid gland blepharitis, furuncle of eyelid.