The corner of the eye is rich in lid glands, which are susceptible to bacterial infections that can lead to mucus blockage in the lid glands and result in a small package that matures into an abscess. This is a painful, red, swollen eyelid with nodular elevation that does not affect vision. If an eruption has formed, a sharp knife is needed to puncture the pustule and scrape the pus from the cavity in order to recover. During the treatment period, the abscess should not be squeezed to prevent the infection from spreading and aggravating the condition, resulting in more serious eye swelling.