Sometimes excess oils, bacteria, or other substances clog the eyelid glands. These clogged glands develop into small, red bumps on the interior or exterior of the eyelids. These harmless styes can become infected, at which point the stye begins to resemble a pimple and secrete yellow mucus. In some cases, the affected eye may feel bruised and be sensitive to light. Though it can be tempting to pop the stye, doing so could result in a dangerous skin infection.
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