Understanding a Stye: What It Is and Why It Happens
What Is a Stye?
A stye (also spelled “sty,” medically called a hordeolum) is a red, painful bump on your eyelid. It looks a lot like a pimple, but it’s caused by a localized infection. Usually, it’s due to bacteria (often Staphylococcus) infecting an oil gland in your eyelid, or the base of an eyelash follicle. Healthline+2Harvard Health+2
There are two types:
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Internal styes: develop deeper in an oil-producing gland inside the eyelid. Harvard Health