What causes a sty on the lid of the eye?
It is caused by the infection of the sebaceous glands on the lids of the eyes. These infections generally are caused by the presence of a staphylococcus bacteria. When a sty begins to form, you will experience irritation in the infected eye.
What kind of eyelid bump looks like a stye?
But a stye, also known as an external hordeolum, is a common eye condition. A chalazion is a bump on the eyelid that looks much like a stye. They have similar causes and symptoms, too, but there are some differences.

How long does a stye on the side of the eye last?
A stye (or sty) is a small, red, painful bump near the edge of the eyelid. It’s also called a hordeolum. This common eye condition can happen to anyone. It usually lasts for two to five days. In some cases a stye may last for a week or longer.
How can I get rid of a stye on my eyelids?
Styes are caused by infected oil glands on your eyelids, which form a red bump that resembles acne. Poor hygiene, old makeup, and certain medical or skin conditions can increase your risk for styes. To get rid of a stye, you can gently wash your eyelids, use a warm compress, and try antibiotic ointments.
What causes a stye on the outer side of the eye?

A stye that happens on the outer side of your eyelid is usually the result of an infection at the bottom of your eyelash. A stye that develops on the inner side of your eyelid is most likely from an infection in one of the oil-producing glands that line your eyelids. These glands help keep your eyes and lashes healthy.
What can cause a stye to turn into a chalazion?
Skin cancer also can cause styes and chalazia, though this is rare. Also, a stye left untreated can sometimes turn into a chalazion. There are some things you can do to lower the odds that you’ll get a stye or chalazion: Take off eye makeup before you go to bed. Disinfect your contact lenses.
Can a blocked eyelash cause a chalazion?
A chalazion is more likely to return. Adults tend to develop styes and chalazia more often than children, but anybody can get one. A stye usually stems from a blocked eyelid oil gland or clogged eyelash follicle. Stress and hormonal changes also can bring on a stye.