Eyelid afflictions are a common medical issue that can cause discomfort and irritation. Two of the most common eyelid afflictions are styes and sties. A stye is an infection of the oil glands in the eyelid, which can cause redness, swelling, and pain. Sties are caused by an infection of the sweat glands in the eyelid, which can cause redness, swelling, and itching. Both styes and sties can be treated with antibiotics or warm compresses.