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The short version
- Demodex are tiny mites that live in hair follicles and oil glands, including around the eyelashes. They become more common with age.
- The telltale sign is collarettes: dandruff-like cuffs wrapped around the base of the lashes.
- Symptoms include itchy lid edges, redness, crusting, a gritty feeling and sometimes lash loss.
- Lotilaner (Xdemvy), approved in 2023, is the first drug approved specifically for it.
- Tea tree oil products and lid hygiene help some people, but the evidence is weaker.
What Demodex blepharitis is
Blepharitis means inflammation of the eyelid margins. One of its most common causes is Demodex, a group of microscopic mites that live on human skin. One species lives in eyelash follicles; another burrows into the oil glands along the lid. Almost everyone picks them up over the years, and they’re far more common in older adults.
In small numbers they’re harmless. The problem is overgrowth. Large numbers of mites, their waste and the bacteria they carry irritate the lid margin, trigger inflammation and can block the oil glands that protect your tears. That’s why Demodex blepharitis and dry eye so often travel together.
Signs and symptoms
The most reliable sign is collarettes: waxy, dandruff-like cuffs that wrap around the base of individual lashes, like a sleeve. Doctors consider them the hallmark of Demodex. You may be able to see them yourself in a magnifying mirror by looking down and examining the base of your upper lashes.
Other common symptoms include:
- Itching along the lash line, often worse in the morning
- Red, swollen or thickened lid edges
- Crusting or flakes on the lashes
- A gritty, burning or foreign body feeling
- Lashes that fall out, grow in odd directions or stick together
- Recurring styes, and contact lenses that become uncomfortable
Many people put up with these symptoms for years, assuming they’re just allergies or dry eye.
How it’s diagnosed
An eye doctor looks at your lashes under a slit lamp microscope, often asking you to look down so the base of the upper lashes is visible. Collarettes are usually enough for a diagnosis. Sometimes the doctor gently removes a lash or two and looks for mites under a microscope.
Treatments that work
Lotilaner (Xdemvy)
Strong evidence Approved in 2023, lotilaner is the first prescription drop made to treat Demodex blepharitis. It paralyzes and kills the mites. It’s used twice a day for six weeks. In the Saturn-2 phase 3 trial, 56% of patients had their collarettes fully cleared after six weeks, compared with 12.5% on a placebo drop, and about half had no mites left1 Saturn-2 phase 3 trial, Ophthalmology, 2023 (opens in a new tab). Lotilaner Ophthalmic Solution 0.25% for Demodex Blepharitis: Randomized, Vehicle-Controlled, Multicenter, Phase 3 Trial (Saturn-2).. Across its two pivotal trials, it was tested in 833 people2 US FDA, Drug Trials Snapshot: Xdemvy, 2023 (opens in a new tab). Drug Trials Snapshots: XDEMVY..
Tea tree oil and terpinen-4-ol
Mixed evidence Tea tree oil, and terpinen-4-ol, the compound in it that’s most active against mites, have been used for years. Some studies show fewer mites and better symptoms, but a Cochrane review judged the evidence uncertain and noted that lower concentrations are less likely to irritate3 Savla et al., Cochrane Database of Systematic Reviews, 2020 (opens in a new tab). Tea tree oil for Demodex blepharitis.. Ready-made wipes are safer than mixing your own oil, which can burn the eye.
Daily lid hygiene
Good evidence Cleaning the lash line every day reduces debris and eases blepharitis symptoms in trials4 Lindsley et al., Cochrane Database of Systematic Reviews, 2012 (opens in a new tab). Interventions for chronic blepharitis.. On its own it rarely clears a heavy mite load, but it helps any other treatment work and keeps things under control afterwards. Hypochlorous acid sprays are a gentle option for daily use.
In the clinic
Many eye doctors offer in-office lid margin cleaning, which removes collarettes and debris in one session. It’s often combined with one of the treatments above.
Sensible habits
- Wash pillowcases and face towels regularly.
- Replace old mascara and eyeliner, and don’t share eye makeup.
- Treat rosacea if you have it, since it often travels with lid problems.
Products that can help
These support lid hygiene at home. If you have obvious collarettes, see an eye doctor as well, because prescription treatment is far more effective.
Tea tree (terpinen-4-ol) lid wipes
Cliradex Lid Wipes
Uses terpinen-4-ol, the part of tea tree oil that is most active against Demodex mites, in a pre-measured wipe instead of a DIY mix.
Worth knowing. It can sting. Keep it on the lash line, out of the eye, and stop if your lids get more irritated.
Hypochlorous acid lid cleanser
Avenova Lid & Lash Spray
0.01% hypochlorous acid, a mild antimicrobial your own white blood cells also produce. Spray onto a cotton pad and wipe along the lash line.
Worth knowing. Good for daily lid hygiene. It is not a proven Demodex treatment on its own.
Lid cleansing pads
OcuSoft Lid Scrub Plus
Pre-soaked pads for cleaning the lash line. The easiest way to turn lid hygiene into a daily habit.
Worth knowing. Use it once a day to start. Scrubbing harder or more often can irritate the lids.
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The free Dry Eye Profile sorts your symptoms into a likely type and gives you a plan in about three minutes.
Common questions
Are eyelid mites contagious?
Demodex can pass between people through close contact, and nearly all adults have some. Having mites isn’t the problem, an overgrowth is. There’s no need for family members to be treated unless they have symptoms.
Can I see Demodex mites?
No. The mites are a fraction of a millimeter long. You may be able to see the collarettes they leave at the base of your lashes with a magnifying mirror.
Does tea tree oil kill eyelid mites?
Tea tree oil and its active compound terpinen-4-ol can reduce mite numbers, but the evidence is mixed and strong concentrations can irritate the eyes. Use ready-made products designed for the eyelids, not neat oil.
How long does it take to get rid of Demodex?
The prescription treatment lotilaner is used for six weeks. Home treatments usually take at least that long, and mites can return, so ongoing lid hygiene helps.
Can Demodex cause eyelash loss?
Yes. Heavy infestations can damage lash follicles, causing lashes to fall out or grow in the wrong direction. Lashes often recover once the mites are under control.
Sources
- Lotilaner Ophthalmic Solution 0.25% for Demodex Blepharitis: Randomized, Vehicle-Controlled, Multicenter, Phase 3 Trial (Saturn-2) (opens in a new tab). Saturn-2 phase 3 trial, Ophthalmology, 2023.
- Drug Trials Snapshots: XDEMVY (opens in a new tab). US FDA, Drug Trials Snapshot: Xdemvy, 2023.
- Tea tree oil for Demodex blepharitis (opens in a new tab). Savla et al., Cochrane Database of Systematic Reviews, 2020.
- Interventions for chronic blepharitis (opens in a new tab). Lindsley et al., Cochrane Database of Systematic Reviews, 2012.
Symvana guides are researched from primary sources and updated when the evidence changes. They’re for education and don’t replace an eye exam.