Stye refers to bacterial infection of the oil-producing glands of the eyelid resulting in: - A swelling on the lid margin - Pain - Redness and tenderness - Blurred vision - Light sensitivity - Sensation of foreign object in the eye If stye is considerably large, it can cause drooping of the eyelid. The most common causative agent of stye is staphylococcus aureus. The stye is usually self-limiting. The condition resolves within 2 weeks. Warm compression can help with the pain and tenderness. Topical antibiotics such as erythromycin and chloramphenicol can be given in case of multiple styes. Incision and drainage is the last resort of management. Reference: https://en.wikipedia.org/wiki/Stye#Signs_and_symptoms Image via: https://www.healthline.com/health/eye-health/are-styes-contagious