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chalazion
(kә-la´ze-on)
pl. chala´zia, chalazions
a small eyelid mass resulting from chronic inflammation of a meibomian gland; it can sometimes be treated at home with the application of hot compresses, but while this method is usually successful
with a sty, a similar infection that has not yet formed a cyst, chalazion often requires incision and drainage. Called also meibomian cyst.

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