Sty (Stye, Hordeolum)
Melissa Conrad Stöppler, MD
Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
- What is a sty?
- What is the cause of a sty?
- What are sty symptoms and signs?
- How is a sty diagnosed?
- Who is most susceptible to the development of a sty?
- What is the treatment for a sty? Is there a home remedy for a sty?
- What is the prognosis (outcome) of a sty?
- Are there any potential complications resulting from a sty?
- Can a sty be prevented?
- Sty (Stye, Hordeolum) At A Glance
- Patient Comments: Sty (Stye) - Treatments
- Patient Comments: Sty (Stye) - Describe Your Experience
- Patient Comments: Sty (Stye) - Symptoms
- Find a local Eye Doctor in your town
What is a sty?
A sty (sometimes spelled stye) is a tender, painful red bump located at the base of an eyelash or under or inside the eyelid. A sty results from a localized infection of the glands or a hair follicle of the eyelid. The medical term for a sty is hordeolum (plural, hordeola).
The term external hordeolum refers to a sty that develops at the base of an eyelash (the hair follicle), whereas the term internal hordeolum refers to a sty that develops in a meibomian gland, a gland located on the underside of the eyelid that secretes an oily substance onto the eyeball.
A sty is sometimes confused with a chalazion (see below), which is a cyst or a specific type of scarring due to chronic inflammation arising in the meibomian glands of the eyelid. A chalazion may develop when the infection of a sty persists over time, resulting in scarring around the meibomian gland. In contrast to a sty, a chalazion is usually painless.
What is the cause of a sty?
A sty results from an infection of the oil glands of the eyelid (meibomian glands) that help to lubricate the eyeball. The infection occurs after these glands have become clogged. A sty also may arise from an infected hair follicle at the base of an eyelash. The bacterium Staphylococcus aureus that is frequently found on the skin is responsible for 90%-95% of cases of styes. A sty also can develop as a complication of diffuse inflammation of the eyelid (blepharitis).
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