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A stye is an infection of the eye that causes a pustule to form on the upper or lower eyelid. This results from infected or inflamed oil glands or follicles in your eyelid. A stye can be painful ...

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Stye A stye is an eye infection caused by oil or bacteria blocking the oil glands or hair follicles around your eye. It is often characterized by a pimple-like bump on your upper or lower eyelid.