Styes are normally caused by bacteria found on our skin, usually staph bacteria, that get into the oil glands on the eyelid and irritate them. You’re at a higher risk of developing styes if you suffer from sleep deprivation or poor nutrition. Few other things which put you at higher risk for developing styes are known as blepharitis, ocular rosacea, advanced age. When wearing masks, our breath tends to go upwards towards our eyes and can cause them to dry out. The bacteria from a breath can clog the glands in our eyelids, which can lead to styes.