A hordeolum, also known as stye, is swelling of the lids caused by an infection, while a chalazion is inflammation of the eyelids that is not infectious. HORDEOLUM Staphylococcal infections of Zeis or meibomian glands result in Hordeolum externum or Hordeolum internum respectively. Even though the cause is infectious, hordeolum isn’t contagious. Infection occurs because … Continue reading IS THAT A STYE? IS THAT A HORDEOLUM? IT’S A CHALAZION!