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Stye, sty. An infection of a sebaceous gland of the eyelid. This is distinguished from a chalazion, which is not infected, but a cyst formed from an impacted meibomian gland of the eyelid.
A sty, or external hordeolum, is a common childhood infection of an oil gland on the surface of the upper or lower eyelids at the base of the eyelash.
An internal hordeolum is an infection deeper inside the eyelid.
Sty-An external hordeolum caused by an infection of an oil gland on the eyelid.
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