A stye(medical term: hordeolum) develops when an oil gland at the edge of an eyelid, or an eyelash follicle, becomes infected. Resembling a pimple on the eyelid, a stye can grow on the inside or outside of the lid.

The first signs of a stye are pain, redness, swelling and tenderness. After symptoms appear, a small pimple will develop in the affected area. Usually, this is accompanied by swollen eyes. Sometimes just the immediate area is swollen; at other times, the entire eyelid swells.

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