Blepharitis: Causes, Demodex, Lid Hygiene and Long-Term Care

Blepharitis is inflammation of the eyelid margins, the edges of the lids where the eyelashes grow and the tiny oil glands open. It is one of the most common reasons people visit optometrists and eye doctors. Typical signs are red, swollen or itchy lid edges, crusts or flakes at the base of the lashes and eyes that feel gritty, burning or tired. Blepharitis usually affects both eyes and tends to come and go over months and years.

Blepharitis rarely threatens vision, but it can be persistently uncomfortable and is closely tied to dry eye, styes and chalazia. It cannot usually be cured permanently, yet it can be controlled very well with a consistent daily routine. This guide explains the different types of blepharitis, the role of bacteria, oil gland problems and Demodex mites, a step-by-step lid hygiene routine, treatment options when hygiene is not enough and how to manage the condition in the long term.

How the eyelid margin works

Each eyelid margin contains rows of eyelash follicles with small associated glands, and behind them a row of meibomian glands, about 25 to 40 in each upper lid and slightly fewer in each lower lid. These glands release an oily secretion (meibum) with every blink. The oil spreads across the tear film and slows evaporation. When the lid margin becomes inflamed, scales build up, the glands become blocked and the oil changes from clear and fluid to thick and cloudy. The tear film then breaks up quickly, and the eye surface becomes dry and irritated. You can learn more about these structures in our guide to the anatomy of the eye.

Types of blepharitis

Many people have a mix of both types. The distinction matters because the emphasis of treatment differs: anterior blepharitis responds especially well to lid cleaning, while posterior blepharitis needs heat and gland expression to clear the oil.

Staphylococcal and seborrhoeic blepharitis

Bacteria that normally live on the skin, especially Staphylococcus species, can overgrow on the lid margin and trigger inflammation, partly through toxins they release. Seborrhoeic blepharitis is linked to seborrhoeic dermatitis, the condition behind dandruff and flaky skin around the nose and eyebrows, and produces greasy scales on the lashes.

Demodex blepharitis

Demodex are microscopic mites that live in human hair follicles and oil glands. Almost everyone has some, and their numbers increase with age. In some people, an overgrowth of Demodex on the eyelashes contributes to blepharitis. The classic sign is cylindrical dandruff, also called collarettes: waxy, sleeve-like collars wrapped around the base of the eyelashes. Demodex blepharitis often causes itching, especially in the morning, redness of the lid margin, lash loss and recurrent styes. It is particularly common in people with rosacea.

Treatments for Demodex include tea tree oil-based lid products (applied carefully, because tea tree oil can irritate the eye) and, in some countries, specific prescription eye drops designed to kill the mites. Your eye care professional can confirm the diagnosis with a slit lamp and advise on the best option.

Posterior blepharitis and meibomian gland dysfunction

In meibomian gland dysfunction (MGD), the glands produce less oil or oil of poor quality, and the openings become plugged. This is the most common cause of evaporative dry eye. MGD is linked with ageing, rosacea, hormonal changes, contact lens wear, screen work with reduced blinking and certain medicines, such as isotretinoin for acne.

Symptoms

• Red, swollen, itchy or burning eyelid margins.
• Crusting or flakes on the lashes, often worse on waking, sometimes with lids sticking together.
• Gritty or sandy sensation, as if something is in the eye.
• Watery or, paradoxically, dry eyes.
• Light sensitivity and fluctuating, slightly blurred vision that clears with blinking.
• Loss of eyelashes, lashes growing in the wrong direction, or white lashes.
• Recurrent styes or chalazia.

Who gets blepharitis?

Blepharitis can occur at any age, including in children, but it is more common in adults and becomes more frequent with age. It is associated with skin conditions such as rosacea, seborrhoeic dermatitis and eczema, with dry eye, with contact lens wear and with heavy use of eye makeup. People with ocular rosacea may also have facial flushing, redness on the cheeks and nose and small visible blood vessels. Our guide to eye allergies covers itchy eyes that may be confused with blepharitis.

The daily lid hygiene routine

Lid hygiene is the cornerstone of treatment for all types of blepharitis. Many people notice improvement within two to four weeks, but the routine needs to continue long term, often once a day, to keep symptoms away.

1. Warm compress (5 to 10 minutes): soak a clean cloth in warm water, wring it out and hold it on your closed eyelids, re-warming as it cools. A microwaveable or heated eye mask holds temperature more steadily. Warmth softens hardened oil in the glands and loosens crusts. Our guided warm compress routine can help you time it.
2. Gentle lid massage (about 30 seconds per lid): with eyes closed, use a clean fingertip to roll gently from the base of the lashes towards the lid margin, downwards on the upper lid and upwards on the lower lid. This helps express oil from the meibomian glands.
3. Clean the lid margins: use a pre-moistened lid wipe, a lid-cleansing foam or a cotton bud dipped in cooled boiled water with a few drops of baby shampoo. Wipe gently along the base of the lashes of each lid to remove crusts and debris, using a fresh wipe for each eye.
4. Rinse with clean water if using a soap-based cleanser.
5. Repeat once or twice a day during flare-ups, and once a day or a few times a week for maintenance.

The link between blepharitis and dry eye

Blepharitis and dry eye are so closely connected that some experts consider them part of the same spectrum of disease. Inflamed lid margins and blocked meibomian glands produce poor-quality oil, so the tear film evaporates faster, which leads to evaporative dry eye. Dry, inflamed eyes in turn make the lid margins more irritated. This explains why artificial tears alone often give only partial relief: the lids must be treated too. If your main symptoms are grittiness, burning and fluctuating vision, read our full guide to dry eye disease and consider our dry eye symptom questionnaire.

Treatment beyond lid hygiene

If symptoms persist despite several weeks of consistent lid care, an optometrist or eye doctor may recommend additional treatment:

• Preservative-free artificial tears, including lipid-containing drops, to support the tear film. See how to choose artificial tears.
• Antibiotic ointment applied to the lid margin for a limited period in anterior blepharitis with significant bacterial involvement.
• Oral antibiotics from the tetracycline family, or macrolides in some cases, taken at low doses for several weeks for their anti-inflammatory effect on the meibomian glands, particularly in rosacea. These are not suitable for everyone, including pregnant women and young children; your doctor decides.
• Short courses of mild steroid drops to calm severe inflammation, under supervision because of risks to eye pressure.
• Anti-Demodex treatments, such as tea tree oil-based products or specific prescription drops where available.
• In-office treatments, such as thermal pulsation devices, gland expression, lid margin debridement or intense pulsed light (IPL), offered in some clinics for meibomian gland dysfunction.
• Treating associated skin conditions such as rosacea or seborrhoeic dermatitis with a GP or dermatologist.

Omega-3 supplements are sometimes suggested, but evidence is mixed: the large DREAM trial found no benefit over placebo for moderate to severe dry eye.

Long-term management and everyday tips

• Continue a maintenance lid routine even when your eyes feel fine.
• Remove all eye makeup every night and replace mascara and eyeliner every three months. Avoid applying eyeliner to the inner lid margin. See eye makeup safety.
• Wash pillowcases and face towels regularly.
• If you wear contact lenses, consider daily disposables and take breaks during flare-ups.
• Take regular screen breaks and blink fully to help the glands express oil.
• Keep your scalp and eyebrows under control if you have dandruff, using anti-dandruff shampoo as advised.
• Do not rub your eyes, as this worsens inflammation.

Blepharitis can flare during periods of stress, illness, hormonal change or when the air is dry. Expect ups and downs, and restart a more intensive routine as soon as symptoms return.

Possible complications

Most people experience discomfort only, but untreated or severe blepharitis can lead to styes and chalazia (see stye and chalazion), chronic red eye, conjunctivitis, lash problems such as lashes turning inward (trichiasis), scarring of the lid margin and, uncommonly, inflammation or ulcers of the cornea (marginal keratitis). Corneal involvement causes pain, light sensitivity and blurred vision and requires prompt treatment.

When to see a doctor

See an optometrist, pharmacist or GP if your eyelids remain red, crusty or uncomfortable despite two to four weeks of regular lid hygiene, if you have frequent styes, if you lose eyelashes or if you think you might have rosacea or Demodex. An eye professional can confirm the type of blepharitis and tailor treatment.