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A stye (or sty) is an acute infection of the secretory glands of the eyelids.
Frequently, bacteria can enter and infect an eyelid oil gland, which are present in both the upper and lower eyelids, causing increased inflammation, pain, and redness of the eye, and even redness of the surrounding eyelid and cheek tissue. The medical term for stye is hordeolum.
The lump can point externally (outward) or internally (inward). These conditions are medically known respectively as an external hordeolum and internal hordeolum. Frequently, the lump appears with a visible whitish or yellowish spot that looks much like a large pimple. Usually, one obvious area of swelling is apparent on one lid, but many styes can appear on one or both eyelids simultaneously.
The lump frequently goes away when the blockage of the gland opening is relieved. Furthermore, the infection goes away when the pus is drained from the stye.
Medically Reviewed by a Doctor on 9/16/2015
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