Eye inflammation is a general term used to describe a range of conditions that cause redness, swelling, and irritation of the eye. The most common types of eye inflammation are iritis (6 letters), STYE (4 letters), and STY (3 letters). Iritis is an inflammation of the iris, the colored part of the eye, which can cause pain, redness, and sensitivity to light. A STYE is an infection of the eyelid caused by bacteria, resulting in a red, swollen bump on the eyelid. A STY is a similar infection, but it is located inside the eyelid, causing redness, swelling, and pain.