Stye

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A stye, also known as a hordeolum, is a bacterial infection of an oil gland in the eyelid. This results in a red tender bump at the edge of the eyelid. The outside or the inside of the eyelid can be affected. The cause of a stye is usually a bacterial infection by Staphylococcus aureus. Internal styes are due to infection of the meibomian gland while external styes are due to an infection of the gland of Zeis. A chalazion, on the other hand, is a blocked meibomian gland without infection. A chalazion is typically in the middle of the eyelid and is not painful. Often, a stye will go away without any specific treatment in a few days or weeks. Recommendations to speed improvement include warm compresses. Occasionally antibiotic eye ointment may be recommended. While these measures are often recommended, there is little evidence for use in internal styes. The frequency at which styes occur is unclear; they may occur at any age.

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