Itchy eyelashes that are also falling out usually point to inflammation along the eyelid margin, a condition called blepharitis. This is the most common cause by far, but allergic reactions, tiny parasitic mites, and autoimmune conditions can also trigger the combination of itching and lash loss. The good news: most causes are treatable, and lashes typically grow back once the underlying problem is resolved.
Blepharitis: The Most Likely Cause
Blepharitis is inflammation of the eyelids, and it comes in two forms that often overlap. Anterior blepharitis affects the base of your lashes, where they attach to the lid. It’s usually caused by bacteria on the skin or dandruff from the scalp and eyebrows. Posterior blepharitis involves clogged oil glands along the inner edge of the eyelid and is linked to skin conditions like rosacea.
Both types cause itching, redness, and a gritty or burning sensation. When the inflammation is chronic or severe enough, lashes loosen from damaged follicles and fall out. This lash loss isn’t permanent in most cases. Once the inflammation is controlled, regrowth follows. Eyelashes grow at about 0.15 mm per day and go through a full cycle every five to six months, so expect a slow return rather than a quick one.
Demodex Mites and Nighttime Itching
Tiny parasitic mites called Demodex live in the hair follicles of most adults without causing problems. But when their population grows too large, they become a significant cause of blepharitis. These mites feed on skin cells at the base of your lashes, and their sharp mouthparts create tiny abrasions that irritate the follicle. They also clump together and lay eggs at the lash root, physically stretching and distending the follicle until lashes loosen and fall out.
The hallmark clue is itching that gets worse at night or early in the morning. Demodex mites are more active in the dark, and their digestive enzymes, shed exoskeletons, and waste products trigger an inflammatory and allergic response on the lid surface. Your eye doctor can often spot the signs during a slit-lamp exam: waxy, cylindrical buildup (called collarettes) wrapped around the base of each lash.
In 2023, the FDA approved the first prescription eye drop specifically for Demodex blepharitis. It works by killing the mites directly and is now considered a first-line treatment. Before this, the standard approach involved scrubbing lids with diluted tea tree oil, which can be effective but carries real risks near the eyes. Lab studies have shown that tea tree oil’s active component is toxic to the oil gland cells in the eyelid at concentrations commonly sold over the counter. Formulations at 2% have been tested for safety, but higher concentrations can cause irritation or damage. If you want to try tea tree oil products, stick to commercially formulated eyelid wipes or cleansers rather than applying the essential oil directly.
Allergic Contact Dermatitis
The skin on your eyelids is the thinnest on your body, making it especially vulnerable to allergic reactions. If your itching and lash loss started after introducing a new product, an allergic reaction is a strong possibility. The seven most common allergen groups responsible for eyelid dermatitis are metals, shellac, preservatives, topical antibiotics, fragrances, acrylates, and surfactants.
In practical terms, this means reactions can come from surprising sources. Nickel in eyelash curlers or tweezers. Shellac in mascara. Preservatives like formaldehyde-releasing chemicals in eye creams and lid cleansers. Acrylates in eyelash extensions and adhesive glues. Fragrances in nearly any cosmetic product. Even some medicated eye drops contain preservatives (like benzalkonium chloride) that trigger eyelid reactions in sensitive people. Surfactants found in eyelid hygiene products marketed for blepharitis can themselves become the problem.
The fix is straightforward but sometimes detective-like: stop using the suspected product and see if things improve over a couple of weeks. If you can’t identify the culprit, a dermatologist can perform patch testing to pinpoint the exact allergen.
Autoimmune Conditions
When lash loss happens in patches on both upper and lower eyelids, with no redness, crusting, or obvious irritation, an autoimmune process may be at work. Alopecia areata, the same condition that causes round bald patches on the scalp, can target eyelashes. The immune system mistakenly attacks hair follicles, causing lashes to fall out in clusters. Itching can precede or accompany the hair loss, though it tends to be milder than with blepharitis.
A less common autoimmune cause is discoid lupus, which typically shows up as red, scaly patches on the eyelids with a preference for the lower lids. In some cases, lash loss appears before any visible skin changes, making it easy to overlook. The key difference from blepharitis or mites: autoimmune lash loss tends to be patchy and bilateral, often affecting eyebrows and scalp hair simultaneously. If you’re losing hair in multiple areas of your face or head alongside your lashes, that pattern points toward an autoimmune evaluation rather than a topical eyelid problem.
Fungal and Other Infections
Fungal infections of the eyelid are uncommon but do occur, causing partial lash loss on one or both sides. Under magnification, the lashes appear broken, bent, or have an unusual banded pattern. The surrounding skin is usually scaly. These infections are more likely in people with weakened immune systems or after prolonged use of steroid eye drops. Treatment requires antifungal medication rather than the antibiotics used for bacterial blepharitis, so getting the right diagnosis matters.
What You Can Do at Home
Warm compresses are the foundation of eyelid care for most causes of itchy, falling lashes. A clean washcloth soaked in warm water and held against closed eyes for five to ten minutes loosens crusted debris, softens clogged oil glands, and soothes irritation. Follow up by gently cleaning along the lash line with a cotton swab or lint-free pad.
Hypochlorous acid sprays, available over the counter as eyelid cleansers, are another option. These come in a 0.01% concentration approved for use on the eye area. In clinical use, patients typically applied the spray twice a day for around 20 days as part of their blepharitis management. It works as an antimicrobial without the irritation risk of stronger solutions. Look for products labeled specifically for periocular (around the eye) use.
Avoid rubbing your eyes, even when the itching is intense. Rubbing mechanically loosens lashes that are already weakened by inflammation and can introduce more bacteria to the lid margin. If over-the-counter lid hygiene doesn’t improve things within two to three weeks, or if the lash loss is accelerating, it’s time for a professional evaluation.
Patterns Worth Paying Attention To
Losing a few lashes here and there is normal. Your lashes are constantly cycling through growth and shedding phases. What’s not normal is noticeable thinning, bare patches, or lash loss paired with persistent itching or skin changes. The American Academy of Ophthalmology specifically flags these patterns as reasons to seek care promptly: lash loss affecting both eyelids, simultaneous hair loss on your eyebrows or scalp, skin changes like redness or scaling around the eyes, a feeling of pressure behind or around the eyes, and any change in vision. These combinations can signal conditions ranging from autoimmune disease to, rarely, eyelid tumors that need to be ruled out.
In non-scarring forms of lash loss, which include most cases of blepharitis, allergic reactions, and alopecia areata, regrowth generally happens once the underlying cause is treated. Scarring causes, where the follicle itself is destroyed, are less common but do result in permanent loss in the affected area. Getting an accurate diagnosis early gives your lashes the best chance of coming back.