A stye is caused by a bacterial infection, most commonly by the bacterium Staphylococcus aureus , which infects an oil gland in the eyelid. This infection leads to a red, painful bump near the edge of the eyelid, similar to a pimple
. The infection typically occurs when an oil gland or eyelash follicle becomes blocked, allowing bacteria to grow inside. This blockage and infection cause swelling, redness, and tenderness. Factors that can contribute to stye formation include touching or rubbing the eyes with unclean hands, using old or contaminated eye makeup, and underlying conditions like blepharitis or diabetes
. In summary, the main causes of a stye are:
- Bacterial infection, primarily Staphylococcus aureus
- Blockage of oil glands or eyelash follicles in the eyelid
- Risk factors such as poor hygiene, eye rubbing, old makeup, blepharitis, and certain medical conditions
Preventive measures include maintaining good eyelid hygiene, avoiding sharing eye makeup or towels, and treating underlying eyelid conditions
