Medical Author: Melissa Conrad Stöppler, MD
- tenderness usually accompany the lump on the eyelid.
It may be painful to blink the eye, and excess watering or tearing can result. In some cases, there is a small, yellow spot at the center of the bump; this is a collection of pus.
Causes of a sty
There are two types of sties, hordeolum and chalazion. A hordeolum is a blockage of a sweat gland on the skin of the lid and base of the eyelashes, or one of the small sebaceous glands found at the base of the eyelashes. A chalazion is a blockage of a meibomian gland, a special sebaceous gland unique to the eyelids. These glands are located in a single row in each lid.
Blockages of either of these gland types happen if the gland's opening is obstructed for any reason. Common causes of the blockage are scar tissue, foreign substances like makeup or dust, or if there are thickened secretions, causing the material from the gland to flow slowly or not at all.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.
Main Article on Sty Symptoms and Signs
Pictures, Images, Illustrations & Quizzes
Common Eye Problems and Infections
Eye diseases can cause damage and blindness if not detected and treated soon enough. Learn the warning signs and symptoms of...
Eye Problems & Conditions Quiz
What do you know about your eyes? Take this quick quiz to learn about a range of eye diseases and conditions....
Picture of Sty (Stye)
A sty (sometimes spelled stye) is a tender, painful red bump located at the base of an eyelash or inside the eyelid. See a...
Sty Symptoms and Signs
Examples of Medications for Sty Symptoms and Signs
Subscribe to MedicineNet's General Health Newsletter