Why Do I Have a Bald Spot on My Eyebrow?

A bald spot in your eyebrow usually signals one of a handful of medical conditions, the most common being alopecia areata, an autoimmune disorder that attacks hair follicles. But the list of possibilities is longer than most people expect, ranging from thyroid dysfunction and scarring conditions to habitual pulling and simple physical trauma. Figuring out which cause applies to you matters because some of these are reversible and others, if left untreated, can become permanent.

Alopecia Areata Is the Most Common Medical Cause

Alopecia areata is an autoimmune condition where the immune system mistakenly targets hair follicles, causing patches of hair to fall out. While most people associate it with bald spots on the scalp, it frequently hits eyebrows too. In patients with severe alopecia areata, roughly three-quarters experience eyebrow or eyelash involvement.¹ The hair loss is “nonscarring,” meaning the follicles themselves survive even though the hair falls out. That distinction is important because it means regrowth is possible once the immune attack subsides or is treated.

Sometimes alopecia areata shows up as an isolated eyebrow patch with no scalp involvement at all, which can be confusing. You might notice a small gap appear over a few weeks, seemingly out of nowhere. Under magnification, a dermatologist can spot telltale signs: exclamation-mark hairs (short hairs that taper at the base), broken hairs, and black dots where hair shafts have snapped off at skin level.² These patterns help distinguish alopecia areata from other conditions that look similar at first glance.

The condition is unpredictable. Some people have a single episode that resolves on its own within months. Others cycle through flares for years. Stress, illness, and genetic predisposition all seem to play a role in triggering episodes, though researchers still don’t fully understand what sets the immune system off in the first place.

Frontal Fibrosing Alopecia and Permanent Loss

Frontal fibrosing alopecia is a more worrying diagnosis. Unlike alopecia areata, this condition causes scarring, which means the follicles are gradually destroyed and replaced with scar tissue. Once that happens, regrowth from those follicles is no longer possible. Partial or complete eyebrow loss is seen in most patients with this condition, and the eyebrow thinning often appears before any noticeable hairline recession on the scalp.³ In fact, eyebrow loss is sometimes the first and only symptom for months or even years.

The condition predominantly affects postmenopausal women, though it has been reported in men and younger women as well. Under dermoscopy, frontal fibrosing alopecia looks different from alopecia areata: instead of exclamation-mark hairs, the hallmarks are dystrophic hairs, white areas around follicles, and hairs regrowing in different directions.² Another related condition, lichen planopilaris, shares some of these features and can also cause eyebrow loss. Trichoscopy findings such as peripilar scaling, peripilar white halos, and empty follicles help clinicians identify this family of scarring conditions.⁴

The urgency with scarring conditions is early intervention. Treatments are aimed at slowing progression rather than reversing what’s already gone. Intralesional steroid injections have been used to try to preserve remaining eyebrow hair,⁵ and low-dose oral minoxidil has shown promise as an add-on therapy, particularly in early disease.³ But the window for meaningful results shrinks as more follicles scar over.

Thyroid Problems and the Queen Anne Sign

If you’ve noticed thinning specifically in the outer third of your eyebrow, your thyroid may be involved. This pattern has a historical name: the Queen Anne sign (also called the Hertoghe sign), and it has been associated with hypothyroidism for well over a century.⁶ The mechanism is straightforward: when thyroid hormone levels are too low, hair growth slows and more follicles shift into their resting phase simultaneously, leading to diffuse thinning or patchy loss.⁷

That said, the Queen Anne sign is described as an uncommon manifestation of hypothyroidism, and most people with thyroid problems will notice other symptoms first: fatigue, weight gain, dry skin, feeling cold all the time.⁶ If you have an eyebrow bald spot and none of those other symptoms, thyroid disease is less likely to be the culprit. But if you have the combination, a simple blood test can confirm or rule out the diagnosis quickly. The good news is that thyroid-related eyebrow loss is usually reversible once hormone levels are brought back to normal with medication.

Trichotillomania and Habitual Pulling

Not all eyebrow bald spots have a medical disease behind them. Trichotillomania, now often called hair pulling disorder, is a compulsive behavior where people repeatedly pull out their own hair. The scalp is the most common target, but eyebrows and eyelashes are the next most frequently affected sites.⁸ Many people who pull their eyebrow hair aren’t fully aware they’re doing it, particularly during moments of concentration, boredom, or anxiety.

The bald patches from trichotillomania can look strikingly similar to alopecia areata, which sometimes leads to misdiagnosis. But under magnification, the two look quite different. In trichotillomania, hairs are broken at irregular lengths rather than tapered, and some may appear tufted or unusually twisted.⁹ A clinician who is alert to the possibility can usually distinguish them, but the diagnosis can be tricky when a patient doesn’t realize or doesn’t disclose the pulling behavior.

Treatment involves addressing the compulsive behavior itself, often through cognitive behavioral therapy and habit-reversal techniques. The eyebrow hair typically regrows completely once the pulling stops, provided the follicles haven’t been damaged by years of repeated trauma. Chronic pulling over a long period can eventually scar follicles, converting a reversible problem into a permanent one.

Scars and Physical Injuries

A bald spot with a visible scar running through it has a more obvious explanation. Eyebrows are vulnerable to cuts and scrapes because of their position on the brow ridge, and up to about one in six facial lacerations involves the eyebrow area.¹⁰ When a wound heals with scar tissue, the follicles in that patch are replaced and can no longer produce hair. This secondary scarring hair loss, called cicatricial alopecia, is often permanent. The earlier a wound is treated properly, the better the odds of preserving the surrounding follicles.

Beyond acute injuries, repeated cosmetic procedures can also cause localized damage. Aggressive waxing over many years, chronic picking at the skin, or even poorly performed cosmetic tattooing can injure the follicles enough to create permanent thin spots. Burns, including chemical burns from hair dye or bleach applied too close to the brow, are another underappreciated cause.

Skin Conditions and Mites

Several inflammatory skin conditions can thin eyebrows. Seborrheic dermatitis, the condition responsible for dandruff, commonly affects the eyebrow area and can cause enough irritation and flaking to weaken hair growth. Eczema and psoriasis can do the same when they flare up on the face.

Then there are Demodex mites, microscopic creatures that live in human hair follicles and are considered a normal part of our skin ecosystem. Most people have them without any issues. But when the population of these mites grows abnormally large, they can trigger inflammation that leads to blepharitis, rosacea, and other skin problems in the eye and brow area.¹¹ Severe Demodex overgrowth can cause enough follicular damage to thin eyebrow hair, particularly in people with weakened immune systems or rosacea-prone skin. Treatment with topical anti-parasitic medications usually resolves the overgrowth and any associated hair thinning.

How Doctors Figure Out the Cause

If your eyebrow bald spot doesn’t have an obvious explanation like a scar, a dermatologist will typically start with a close-up examination using a handheld dermatoscope, a process called trichoscopy. This technique can reveal patterns invisible to the naked eye that point toward specific diagnoses. The characteristic features of alopecia areata (exclamation-mark hairs, black dots) look completely different from those of scarring conditions like frontal fibrosing alopecia (dystrophic hairs, white halos, empty follicles), which allows a clinician to narrow down the cause without needing a biopsy in many cases.²

Blood work is the next step when systemic causes are suspected. A thyroid panel can identify hypothyroidism. Tests for iron, zinc, and vitamin D levels can flag nutritional deficiencies that contribute to hair loss generally. If the clinical picture still isn’t clear, a small skin biopsy from the eyebrow area can provide a definitive diagnosis by showing the pattern of inflammation and whether scarring is present.

The timing of your visit matters more than you might think. With non-scarring conditions like alopecia areata, waiting a few months before seeking treatment isn’t ideal but usually doesn’t change the long-term outcome. With scarring conditions, every month of delay means more follicles permanently lost. If your bald spot is expanding and the skin underneath looks shiny, pale, or feels firm to the touch, those are signs of scarring that warrant a prompt appointment.

Treatment Depends Entirely on the Cause

There isn’t a universal eyebrow regrowth treatment because the right approach depends on what caused the loss. For alopecia areata, treatments range from topical corticosteroids for mild cases to newer medications like baricitinib, a JAK inhibitor taken orally. Clinical trial data show that baricitinib at the higher dose led to eyebrow improvement in about 44% of patients after 36 weeks, compared to roughly 13% on placebo.¹ That’s a meaningful improvement, though far from a guaranteed fix.

For frontal fibrosing alopecia, the focus shifts to stopping further loss rather than restoring what’s gone. Intralesional corticosteroid injections and anti-inflammatory medications are standard. Low-dose oral minoxidil has shown some ability to stimulate regrowth when the disease is caught early.³ Thyroid-related loss resolves with thyroid hormone replacement. Trichotillomania responds to behavioral therapy. Nutritional deficiencies respond to supplementation. Each pathway is straightforward once the diagnosis is correct, which is why getting the diagnosis right is the most important step.

Genetics and Natural Variation

Before assuming something is wrong, it’s worth considering that some eyebrow thinning is just how your genes built you. Eyebrow thickness varies enormously among individuals and across ethnic groups, and researchers have identified specific genetic regions that influence this trait. A large genome-wide study identified variants near genes called SOX2, FOXD1, and EDAR that are significantly associated with eyebrow thickness across multiple populations.¹² These variants contribute to the natural range of brow density, from barely-there to bushy.

Age also plays a role. Eyebrow hair gradually thins with age, particularly after menopause in women and from the 50s onward in men. This thinning is usually diffuse rather than patchy, so if you have a distinct bald spot rather than overall sparseness, something beyond normal aging is more likely at play. Hormonal shifts during pregnancy and menopause can also cause temporary changes in eyebrow density that resolve on their own.

Cosmetic Camouflage and Its Risks

For people whose eyebrow loss is permanent or slow to recover, cosmetic options are popular. Eyebrow pencils and powders offer the simplest solution with no risk. Microblading, a form of semi-permanent cosmetic tattooing, creates hair-like strokes in the skin and has become extremely common. It’s generally well tolerated, but it’s not risk-free.

A review of cases found that microblading can occasionally trigger granulomatous reactions, where the immune system mounts an inflammatory response to the implanted pigment. Of 21 such cases reviewed, about half involved foreign-body granulomas while the remaining cases were split between systemic and localized sarcoidosis.¹³ These reactions are rare, but they can be disfiguring and difficult to treat. People with a personal or family history of sarcoidosis or autoimmune conditions should discuss this risk with a dermatologist before having the procedure. Microblading on skin that is actively inflamed from an ongoing condition like alopecia areata or frontal fibrosing alopecia is generally not recommended, as the inflammation can interfere with pigment retention and worsen the underlying disease.

Eyebrow transplantation, where hair follicles are moved from the scalp to the brow area, is another option for permanent loss. The transplanted hairs grow like scalp hair, meaning they grow faster and longer than natural eyebrow hair and need regular trimming. The procedure works best when the underlying condition has been stabilized so the transplanted follicles aren’t attacked by the same process that destroyed the originals.

Why Eyebrow Loss Feels Different

Losing a patch of eyebrow hair tends to bother people more than you might expect for such a small area of the body. Eyebrows serve as one of the most expressive features of the human face. Evolutionary research suggests that our species’ uniquely mobile, prominent eyebrows evolved specifically to convey subtle social emotions, replacing the heavy brow ridges of our ancestors with a more communicative facial structure.¹⁴ Eyebrows also protect the eyes from sweat, rain, and debris, so their function is both practical and social.¹⁵

Because eyebrows sit at the center of facial recognition and emotional expression, even a small gap can change how your face reads to other people and in the mirror. Studies on people with eyebrow and eyelash loss report significant effects on quality of life, self-confidence, and social comfort.¹⁵ If you’re feeling disproportionately distressed about a bald spot in your brow, that reaction is entirely normal and reflects the outsized role these small strips of hair play in how we see ourselves and how others see us. It’s also a perfectly good reason to see a dermatologist sooner rather than later, because many of the underlying causes respond best to early treatment.

1
Oxford Academic (British Journal of Dermatology). Understanding eyebrow and eyelash involvement in patients with alopecia areata and responsiveness to treatment with baricitinib
2
PubMed. The value of dermoscopy in diagnosing eyebrow loss in patients with alopecia areata and frontal fibrosing alopecia
3
PubMed Central. Eyebrow Regrowth in Patients with Frontal Fibrosing Alopecia Treated with Low-Dose Oral Minoxidil
4
Dermatology Practical & Conceptual. Assessment and Validity of Trichoscopy for Eyebrow Involvement in Lichen Planopilaris: A Case-Control Study
5
Oxford Academic (British Journal of Dermatology). Eyebrow regrowth in patients with frontal fibrosing alopecia treated with intralesional triamcinolone acetonide
6
QJM: An International Journal of Medicine. Eyebrow loss and the Queen Anne sign in hypothyroidism
7
Frontiers in Endocrinology. Dermatologic manifestations of thyroid disease: a literature review
8
Clinics in Dermatology. Assessment and treatment of trichotillomania hair pulling disorder and excoriation skin picking disorder
9
PubMed. Isolated eyebrow and eyelash trichotillomania mimicking alopecia areata
10
PubMed Central. Treatment and Prevention of Traumatic Eyebrow Cicatricial Alopecia With Stem Cell Growth Serum
11
PubMed Central. Beyond the Surface: Understanding Demodex and Its Link to Blepharitis and Facial Dermatoses
12
PubMed Central. GWAS and CRISPR/Cas9-mediated gene editing identify regulatory variants influencing eyebrow thickness in humans
13
PubMed. Microblading-Induced Granulomatous Reaction: Case Report and Review of the Literature
14
Nature Ecology & Evolution. Supraorbital morphology and social dynamics in human evolution
15
PubMed Central. Impact and Management of Loss of Eyebrows and Eyelashes