CausesBy Mayo Clinic staff
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A sty can be caused by:
- Poor hygiene. A sty is usually caused by bacteria, especially the bacterium staphylococcus. Touching your eyes with unwashed hands can transfer bacteria to your eyelids.
- Eyelid inflammation. Chronic inflammation along the edge of the eyelid caused by a condition called blepharitis can cause a sty to form. Blepharitis may be associated with underlying conditions, such as seborrheic dermatitis or rosacea, a skin condition characterized by facial redness. Following your doctor's instructions for treating your blepharitis can help prevent sties.
- Riordan-Eva P, et al. Vaughan & Asbury's General Ophthalmology. 18th ed. New York, N.Y.: The McGraw-Hill Companies; 2011. http://www.accessmedicine.com/resourceTOC.aspx?resourceID=720. Accessed April 26, 2012.
- What Are Chalazia and Styes? American Academy of Ophthalmology. http://www.geteyesmart.org/eyesmart/diseases/chalazion-stye.cfm. Accessed April 25, 2012.
- What you need to know about contact lens hygiene and compliance. American Optometric Association. http://www.aoa.org/x8024.xml. Accessed April 26, 2012.
- Chalazion and hordeolum. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merckmanuals.com/professional/print/eye_disorders/eyelid_and_lacrimal_disorders/chalazion_and_hordeolum.html. Accessed April 26, 2012.
- Eye cosmetic safety. U.S. Food and Drug Administration. http://www.fda.gov/Cosmetics/ProductandIngredientSafety/ProductInformation/ucm137241.htm. Accessed April 26, 2012.
- Robertson DM (expert opinion). Mayo Clinic, Rochester, Minn. May 3, 2012.