Itchy Eyelids
Persistent itching along the lash line, often worse first thing in the morning.
Eyelid Health Guide
Demodex Blepharitis: Causes, Symptoms, and Treatment
Demodex blepharitis is one of the most common and most overlooked causes of itchy, crusty, irritated eyelids. It happens when tiny Demodex mites build up along the lash line. The good news is that it is treatable once it is correctly identified, with consistent lid care and, when needed, a prescription treatment from your eye doctor.
Key takeaways
- Demodex blepharitis is eyelid inflammation caused by an overgrowth of Demodex mites at the base of the lashes.
- The hallmark sign is collarettes, a cylindrical crust at the lash base that an eye doctor can spot.
- Common symptoms include itchy, red, crusty, irritated eyelids, gritty eyes, and recurring styes.
- It often overlaps with dry eye and meibomian gland dysfunction (MGD), and at-home care centers on consistent lid hygiene and warm compresses.
- An eye doctor can confirm the diagnosis and, when needed, prescribe a treatment that targets the mites.
Quick answer
What is Demodex blepharitis?
Demodex blepharitis is a common type of eyelid inflammation caused by Demodex mites that live at the base of the eyelashes. When these mites overgrow, they can cause itching, crusting, redness, and irritation. The telltale sign is collarettes at the lash base, and treatment ranges from daily lid hygiene to a prescription treatment from your eye doctor.
Worth understanding
What Causes Demodex Blepharitis?
Demodex mites are microscopic organisms that naturally live on human skin, including around the eyelashes and oil glands. In small numbers they are normal and usually harmless. Demodex blepharitis develops when these mites overgrow along the lash line and eyelid margin, leading to irritation and inflammation.
The risk of having more mites tends to rise with age, and Demodex is also commonly associated with rosacea and other skin conditions. Because the mites are part of normal skin flora, Demodex blepharitis is generally not considered contagious in the way an infection would be.
Symptoms of Demodex Blepharitis
Symptoms can be mild or persistent, and they often look like ordinary dry eye or general eyelid irritation, which is part of why Demodex blepharitis is so frequently missed.
Crusting and Flaking
Debris and collarettes wrapped around the base of the eyelashes.
Red, Irritated Lids
Redness, swelling, and a gritty or foreign-body feeling in the eyes.
Recurring Styes
Repeated styes or chalazia and ongoing eyelid discomfort.
The telltale sign
Collarettes
The most recognizable sign of Demodex blepharitis is collarettes, a cylindrical, dandruff-like buildup that wraps around the base of the eyelashes. Collarettes are considered a hallmark of the condition because they are closely linked to mite activity at the lash root.
You usually cannot confirm collarettes on your own. An eye doctor can see them under magnification, often by asking you to look down so they can examine the base of your upper lashes. Spotting collarettes is one of the quickest ways to identify Demodex blepharitis.
Worth understanding
Demodex, Dry Eye, and MGD
Demodex blepharitis often does not travel alone. Mite overgrowth and the inflammation it causes can contribute to meibomian gland dysfunction (MGD) and evaporative dry eye, where the oil layer of the tears breaks down and tears evaporate too quickly.
That is why people with Demodex blepharitis often also have burning, gritty, watery, or fluctuating vision symptoms. Treating the mites and supporting the eyelids together usually works better than treating dry eye symptoms alone.
Dry Eye Rescue Tip. If your eyelid symptoms keep coming back despite lid wipes and artificial tears, ask an eye doctor to check your lash line for collarettes. Demodex blepharitis is treatable, but it is often missed when the focus stays only on dry eye. Read more in What Is MGD?
Diagnosis
How Demodex Blepharitis Is Diagnosed
Diagnosis is quick and noninvasive. An eye doctor reviews your symptoms and examines your eyelids and lash line under magnification, looking for collarettes and other signs of mites. In some cases an eyelash may be sampled and viewed under a microscope. A correct diagnosis matters because it points to treatments that actually target the cause.
How Demodex Blepharitis Is Treated
Treatment usually combines daily eyelid care with targeted therapy when needed. Your eye doctor can help you decide what fits your case. Some eye doctors also offer in-office eyelid cleaning procedures. Because the right plan depends on the severity of your case and whether you have related dry eye or MGD, an exam is the best starting point.
Lid Hygiene and Cleansers
Consistent eyelid cleansing helps remove debris and reduce buildup along the lash line.
Warm Compresses
Heated eye masks may help associated MGD and evaporative dry eye symptoms.
Prescription Treatment
When lid care alone is not enough, an eye doctor can prescribe a drop that targets the mites themselves.
When Should You See an Eye Doctor?
An exam can confirm whether Demodex mites are the cause and point you to the right treatment.
- Eyelids that are persistently itchy, crusty, red, or irritated
- Recurring styes or chalazia
- Symptoms that keep returning despite over-the-counter lid care
- Any symptoms that are severe, painful, one-sided, or affecting your vision
Find a Dry Eye Specialist Near You
A quick exam can confirm Demodex blepharitis and identify the right treatment plan. Demodex blepharitis is common and treatable once it is correctly identified, and an eye doctor can check your lash line and recommend the right plan, including prescription options when appropriate.
Related guides
Keep reading, or go back to the complete dry eye guide.
Cause
What Is MGD?
How the eyelid oil glands drive evaporative dry eye.
Read the Guide
Guide
Your Complete Guide to Dry Eye
Causes, testing, treatment and everyday care.
Read the Guide
Testing
Dry Eye Exams and Testing
What a workup checks and what to ask about.
Read the Guide
In office
In-Office Treatments
Device and light-based therapy done at the practice.
Read the GuideFrequently asked questions
What is Demodex blepharitis?
Demodex blepharitis is eyelid inflammation caused by an overgrowth of Demodex mites at the base of the eyelashes. It can cause itching, crusting, redness, irritation, and recurring styes.
What causes Demodex blepharitis?
It is caused by Demodex mites, which naturally live on human skin. When they overgrow along the lash line, they irritate and inflame the eyelids. The risk tends to increase with age and is often associated with rosacea.
What are collarettes?
Collarettes are cylindrical, dandruff-like deposits wrapped around the base of the eyelashes. They are a hallmark sign of Demodex blepharitis, and an eye doctor can look for them during an exam.
Is Demodex blepharitis contagious?
Because Demodex mites are a normal part of human skin, Demodex blepharitis is generally not considered contagious the way an infection would be. If you have symptoms, an eye doctor can confirm the cause.
How is Demodex blepharitis treated?
Treatment usually combines daily lid hygiene and warm compresses with targeted therapy when needed. When lid care alone is not enough, an eye doctor can prescribe a treatment that targets the mites and recommend the right plan for you.
What is the prescription treatment for Demodex blepharitis?
There is an FDA-approved prescription eye drop designed to target and kill the mites that cause Demodex blepharitis. It is available only through an eye doctor, so ask yours whether it is right for you.
Can Demodex blepharitis be cured?
Demodex blepharitis can usually be managed well with the right treatment, though symptoms can return if mites build up again. Ongoing lid hygiene and follow-up with your eye doctor help keep it under control.
Where can I find a doctor who treats Demodex blepharitis?
You can use the Dry Eye Rescue Doctor Locator to find an eye doctor near you who can diagnose Demodex blepharitis and recommend treatment, including prescription options when appropriate.
This page is educational and does not replace medical advice from your eye care professional or healthcare provider. Diagnosis and treatment of Demodex blepharitis should be guided by a licensed eye doctor. If your symptoms are severe, painful, one-sided, or affecting your vision, see an eye doctor promptly.
