A stye is a red lump that appears on the eyelid, causing irritation and redness. Much like an acne lesion, a stye is caused by a clogged hair follicle that becomes infected and fills with pus.

An infected oil gland swells with fluid, creating a sty on the eyelid. This swollen, red bump is sensitive to touch and can occur in individuals of all ages, although certain behaviors increase the risk of experiencing a sty.

A bump in the corner of your eye could indicate a serious problem that might affect your vision. An optometrist or ophthalmologist should check any abnormalities that form near your eyes to prevent further complications.