If you’ve ever had a mysterious pimple on your eyelid, you know that it’s basically impossible to focus on anything else. And even though it seems like the world’s most inconveniently placed pimple, that bump may actually be a stye (also sometimes called a “sty”).
What are the symptoms of a stye?
What people typically call a “stye” is what ophthalmologists know as either a chalazion or a hordeolum. While these terms both sound like something you’d catch during a Pokémon Go session, they’re not nearly as much fun.
A chalazion is a firm ball on the eyelid that doesn’t look inflamed and doesn’t tend to be painful, Lora Glass, M.D., assistant professor of ophthalmology and director of Medical Student Education in ophthalmology at Columbia University Medical Center, tells SELF.
A hordeolum is also a hard sphere that appears like a pimple on the eyelid, but it’s typically inflamed, irritated, and painful or tender. Sometimes these symptoms can signal that the bump has become infected, especially if they don’t get better or actually get worse even after treatment.
However, not everyone can agree on the terminology when it comes to styes, chalazia, and hordeola. “These terms are not used consistently in the medical literature or in the office, because patients often come in with something that blurs the lines,” Dr. Glass says.
So, it makes sense that so many of us use “stye” as a catch-all term. Still, “clinically, we try to stick to ‘chalazion’ or ‘hordeolum’ without using the word ‘stye,’” Dr. Glass says, because those terms more accurately indicate whether or not your eye bump is inflamed.
What causes styes?
These eyelid bumps are similar to pimples, but with one major difference: While pimples can happen *around* your eyes, if you’re dealing with what looks like a pimple directly on the eyelid (especially on your lash line anywhere) or right underneath it, acne probably isn’t your issue. “A ‘stye’ is not really a pimple because pimples on the face form in different glands. These are specialized eyelid glands,” Dr. Glass says.
Chalazia and hordeola both occur when the Meibomian glands on your eyelid get clogged. “Meibomian glands make oil, which is really important because it helps your tear film not evaporate so quickly,” Dr. Glass says. Pretty much anything that causes itchiness, irritation, or inflammation in the area can increase your likelihood of clogging those glands and, then, getting a stye on your eyelid.
A few of the most common causes of these bumps include:
Rosacea: One type of rosacea in particular, ocular rosacea, can cause dry eye and eyelid irritation, Gary Goldenberg, M.D., assistant clinical professor of dermatology at the Icahn School of Medicine at Mount Sinai Hospital, tells SELF. Ocular rosacea is also characterized by redness, swelling, and itching around the eye, which can make styes more likely.
Eczema: This chronic skin condition that can cause red, inflamed breakouts, can also affect the eyelids and contribute to chalazia and hordeola, Dr. Glass adds.
Dusty, allergen-filled air: Anything that causes your eyes to become itchy and irritated—whether that’s because you have dust particles in your eye or because you have seasonal allergies—can lead to a stye. So, if you’re near a construction site or spending a lot of time inside a dusty apartment, that makes eye irritation more likely.
Hormonal fluctuations: Hormones play a huge role in vision and eye health, as they do in many, many bodily functions. Specifically, hormones help regulate the Meibomian glands’ oil production. And if your hormones are fluctuating due to normal monthly changes, a change in birth control, for instance, or a significant increase in stress, that may increase your chances of developing a stye.