Stye (hordeolum): how long it lasts, whether it spreads, and when it is not a stye

A stye is a tender, red lump on the edge of the eyelid, and for most people it settles in one to two weeks with nothing more than warm compresses. The harder question is the other one: how do you tell a stye from a lump that only looks like one? That is where the real risk sits, and it is what this article is for.

What is a stye, and how is it different from a chalazion?

A stye, called a hordeolum in medical language, is a small infected gland at the edge of the eyelid, so it is tender, red and often has a yellow point. A chalazion is a blocked oil gland, usually painless, and it sits further back on the lid. Two questions separate them: does it hurt, and is it on the lid edge?

Each lash grows from a follicle with small glands beside it, the glands of Zeis and Moll. When one of them is infected, the stye sits right at the lid edge. A stye can also start deeper, in a meibomian gland, one of the oil glands set in the tarsal plate, the firm sheet of tissue that gives the eyelid its shape. That is an internal stye, and it is easy to mistake for a chalazion. StatPearls, the clinical reference series, says styes are caused mainly by Staphylococcus aureus, a bacterium that lives on healthy skin.

People describe the same problem in different words: a red bubble on the eyelid, a knot on the lid, a sore bump at the outer corner of the eye. The words matter less than the two questions. A tender bump where the lashes grow is usually a stye. A firm, painless lump set back from the lash line is more likely a chalazion, which I cover in my guide to chalazion, stye or something else. A child's eyelid behaves differently, and Dr Chan Li Yen writes about styes in children. That half of the subject is hers.

How long does a stye last?

Most styes settle within one to two weeks. The NHS says they should go away within a week, and a StatPearls review describes a course of one to two weeks that is self-limiting. Typically a stye builds over a few days, comes to a small head, and then either drains or fades.

Two time limits are worth remembering. The NHS advises seeing a GP if a stye has not got better within a few weeks. And if the tenderness has gone but a firm lump is still there, the lump is probably no longer a stye. A published review of the swollen red eyelid notes that a chalazion tends to be present for longer than two weeks, and StatPearls says an untreated or recurrent stye may evolve into one, a chronic, non-infectious lump. Slow is not the same as dangerous. It does mean the plan changes from waiting to having it looked at.

Is a stye contagious, and can it spread?

A stye is not contagious in the way a cold is, but it is still sensible not to share towels or flannels. The American Academy of Ophthalmology says styes are not contagious and are a local infection or inflammation of the oil glands of the lid. The NHS still advises against sharing towels or flannels with someone who has one.

The spread that matters is inside your own eyelid. In most people the infection stays in the one gland. If it does not, it can move into the soft tissue of the lid in front of the orbital septum, the thin membrane that separates the lid from the eye socket. That is preseptal cellulitis, and StatPearls lists it as a recognised complication, with spread behind the septum rare but needing urgent treatment. The NHS says plainly not to try to burst a stye or remove an eyelash yourself, because doing so can spread the infection.

What helps a stye, and what should I avoid?

Warm compresses are the usual first step, and squeezing is the one thing to avoid. Hold a clean flannel soaked in warm water, not scalding water, against the closed lid. The NHS suggests 5 to 10 minutes, 2 to 4 times a day. The AAO suggests 10 to 15 minutes, 3 to 5 times a day. The aim is to bring the stye to a head so that it drains by itself.

I should be honest about the evidence. A Cochrane review looked for trials of non-surgical treatment of an acute internal stye, including warm compresses, lid scrubs, antibiotics, steroids and lid massage, and found none. That means there is no proof for or against any of them. It does not mean they do harm, and most styes settle anyway: the AAO says most resolve without antibiotics. The NHS adds paracetamol or ibuprofen for the pain, and advises avoiding eye make-up and contact lenses until the stye has healed.

Antibiotics are a doctor's decision. The AAO lists antibiotics for an infected stye, and an infection that has spread into the lid as preseptal cellulitis can be treated with antibiotic tablets, according to a published review in American Family Physician. Leftover drops from an earlier problem are not a plan. A doctor can also drain a stubborn stye with a sterile needle or remove the lash growing from it, both of which the NHS lists, and StatPearls notes that in rare cases the pustule needs drainage. None of these is something to attempt at home.

When does a stye need a doctor, and when is it urgent?

Go the same day if the whole eyelid is red, hot, swollen and painful, if you have a fever, if your vision changes, if the pain is in the eye itself, or if you cannot open the eye. The NHS lists these as reasons for urgent help with an eyelid problem, and a hot, painful, swollen lid is how it describes cellulitis of the eyelid.

Orbital cellulitis, infection of the tissues behind the septum, is the one to know about. A review in the Community Eye Health Journal describes the eye pushed forward, limited eye movement, reduced vision and pain, sometimes with fever, and calls it an emergency because the infection can spread towards the brain. I explain it in my article on orbital cellulitis. An eye that looks pushed forward or hurts to move is not a stye, and it does not wait for morning. The other causes of a suddenly swollen lid are in my guide to one swollen eyelid.

The slower route is simpler. If a stye has not improved after a few weeks, see a GP, as the NHS advises. Most styes are not something to worry about. The ones to worry about are those that spread, those that stay, and those that return in the same place.

When is it not a stye, and why does it keep coming back?

It is not a stye when the lump is painless, firm and set back from the lash line, which makes it a chalazion, or when it is a different kind of bump altogether, such as the small cysts described in my article on small eyelid bumps. A lid that is swollen with no lump at all may be an allergy or an insect bite.

Repeated styes usually have a cause behind them. StatPearls links recurrent styes to blepharitis, rosacea and diabetes. Blepharitis, inflammation of the lid margin, is a long-term condition managed with daily lid care rather than cured, as I explain in my article on blepharitis and lid margin disease. The lump is the symptom. The lid margin is the cause. If you have rosacea or diabetes, mention it to whoever is looking at the repeated lumps.

The lump that should never simply be waited out is the one that returns at the same spot. The AAO says that when a stye or chalazion comes back time after time, an ophthalmologist may take a tiny tissue sample, a biopsy, to look for an underlying problem. A case report in the Indian Journal of Ophthalmology describes an older woman whose lump, removed twice as a chalazion at the same site, proved to be a rare eyelid cancer. Its authors advise considering laboratory examination of the removed material when a chalazion-like lump recurs in an older person, or when lashes are lost or the gland structure is disrupted. That is one case, and such tumours are uncommon. It is the reason a painless lump that keeps returning, bleeds, or takes the lashes with it needs an eye doctor, not another fortnight of compresses. I set out the warning signs in my article on eyelid skin cancer.

This article is general information, not a diagnosis. The wider list of reasons an eyelid looks or feels wrong is in what actually makes eyes look tired, and the lid problems I write about are gathered under eyelid conditions.