A hordeolum is caused by a blockage in the small glands located along the eyelid margin. These glands produce oil and the blockage prevents normal drainage of the gland. If bacteria are trapped in the gland, an infection can develop, and the development of fluid and pus cause the area to become red and inflamed. In 90%-95% of cases, the resulting infection is caused by the bacteria called Staphylococcus aureus (sometimes known as “staph”). It is possible to have more than one hordeolum at a time, and it is common for them to reoccur.
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