Alopecia areata is an autoimmune form of hair loss that commonly causes one or more smooth, round or oval bald patches. It can affect the scalp, beard, eyebrows, eyelashes, and other hair-bearing areas of the body.
Some people develop only one small patch. Others experience several patches, widespread thinning, complete scalp hair loss, or loss of scalp and body hair.
Alopecia areata can begin at any age, although it frequently starts during childhood, adolescence, or early adulthood. Approximately 2% of people may experience it during their lifetime.
The condition is not contagious, and it is different from androgenetic alopecia, traction alopecia, hair breakage, and scarring hair loss.
The course is unpredictable. Hair may regrow without treatment, respond to medical treatment, fall out again, or remain absent for an extended period.
This guide explains the symptoms, types, diagnosis, prognosis, and current treatment options for alopecia areata.
Medical note: Alopecia areata requires an accurate diagnosis. This article provides general educational information and does not replace evaluation by a dermatologist, physician, pharmacist, or another appropriately qualified healthcare professional.
Quick Answer: What Is Alopecia Areata?
Alopecia areata is an autoimmune disease in which the immune system mistakenly targets hair follicles, interrupting normal hair production.
It most commonly produces sudden, smooth patches of hair loss without permanent scarring. The follicles usually remain present and may produce hair again, although the timing and extent of regrowth are unpredictable.
Some people develop diffuse alopecia areata, which causes widespread thinning rather than clearly defined bald patches.
Key Takeaways
- Alopecia areata is autoimmune. It occurs when immune activity disrupts normal hair-follicle function.
- Hair loss is often sudden and patchy. Smooth, round or oval bald patches commonly appear on the scalp or beard.
- It is normally non-scarring. The follicles are usually not permanently destroyed and may produce hair again.
- It can affect more than the scalp. Eyebrows, eyelashes, facial hair, and body hair may also be lost.
- Nail changes can occur. Some people develop nail pitting, ridging, roughness, brittleness, or crumbling.
- The course is unpredictable. Hair may regrow spontaneously, but additional episodes and relapse are possible.
- Diagnosis is usually clinical. Routine biopsy and extensive blood testing are not required in every typical case.
- Treatment depends on severity and age. Options include corticosteroids, contact immunotherapy, and systemic medicines for selected patients.
- Three JAK inhibitors are FDA-approved. Different age and severity requirements apply to baricitinib, ritlecitinib, and deuruxolitinib.
- Supplements do not treat the autoimmune cause. A DHT blocker should not be presented as an alopecia areata treatment.
Experiencing Sudden or Patchy Hair Loss?
Smooth bald patches can suggest alopecia areata, but fungal infection, traction, trichotillomania, telogen effluvium, breakage, and scarring alopecia can produce overlapping changes.
A trichologist can document the visible hair-loss pattern and scalp condition. A dermatologist or another appropriately licensed medical professional can diagnose alopecia areata, prescribe treatment, order targeted tests, and perform a biopsy when necessary.
What Causes Alopecia Areata?
Alopecia areata develops when immune cells mistakenly target hair follicles. This immune activity interrupts normal hair growth and can cause hairs to shed.
The follicles are usually not permanently destroyed. This distinguishes alopecia areata from scarring alopecia, in which inflammation can permanently replace follicles with scar tissue.
The exact reason alopecia areata develops is not fully understood. Current evidence points to a combination of:
- Genetic susceptibility
- Immune-system dysregulation
- Environmental influences
- Possible triggers in susceptible individuals
Alopecia areata is not caused by poor hygiene, brushing, shampooing, or wearing ordinary hats. It is also not simply caused by high testosterone, DHT, or a nutritional deficiency.
Are stress, illness, or hormones responsible?
Some people report an emotionally or physically stressful event before an episode, but stress is not considered the sole cause of alopecia areata.
Illness and hormonal changes can cause other forms of shedding that may resemble or occur alongside alopecia areata. A clear diagnosis is therefore more useful than assuming that every episode of hair loss is stress-related.
Is alopecia areata associated with other conditions?
People with alopecia areata may have a higher likelihood of certain autoimmune or atopic conditions, including thyroid disease, vitiligo, eczema, asthma, and allergic rhinitis.
This association does not mean everyone with alopecia areata has another autoimmune disease. Testing should be based on symptoms, medical history, examination, and professional judgment.
Symptoms and Early Signs
The most recognisable sign is the sudden appearance of one or more smooth patches of hair loss.
Possible signs include:
- Round or oval bald patches on the scalp
- Patchy beard hair loss
- Loss of eyebrow or eyelash hair
- Patches that expand or merge
- Widespread or diffuse scalp thinning
- Short, broken “exclamation-mark” hairs near a patch
- White or grey hairs being spared in some areas
- Temporary itching, tingling, tenderness, or burning
- Nail pitting, ridging, roughness, brittleness, or crumbling
The skin in a typical patch often appears smooth without heavy scale or scarring. Marked redness, crusting, pustules, pain, or loss of follicular openings may point to a different diagnosis.
Types of Alopecia Areata
| Type | Typical Presentation |
|---|---|
| Patchy alopecia areata | One or more smooth, clearly defined areas of hair loss |
| Diffuse alopecia areata | Widespread scalp thinning without obvious round patches |
| Ophiasis | Band-like hair loss around the sides and back of the scalp |
| Alopecia totalis | Complete or nearly complete loss of scalp hair |
| Alopecia universalis | Complete or nearly complete loss of scalp, facial, and body hair |
Learn more about the different types of alopecia areata.
Alopecia Totalis and Alopecia Universalis
Alopecia totalis and alopecia universalis are extensive forms within the alopecia areata spectrum.
Alopecia totalis causes complete or nearly complete scalp hair loss. Alopecia universalis causes complete or nearly complete loss of scalp, facial, and body hair.
These forms can have a more persistent course, although individual outcomes vary and regrowth remains possible.
How Is Alopecia Areata Diagnosed?
A dermatologist can often diagnose a typical case through the history and examination of the scalp, hair, skin, and nails.
The assessment may include:
- The appearance and distribution of hair loss
- How quickly the loss developed
- Whether eyebrows, eyelashes, beard, or body hair are affected
- Scalp symptoms such as pain, burning, scale, or itching
- Nail changes
- Personal and family history of autoimmune or atopic disease
- Medicines, recent illness, stress, and nutritional history
Trichoscopy or dermoscopy
A clinician may examine the area with a magnifying device called a dermatoscope or trichoscope. Findings such as yellow dots, black dots, broken hairs, tapered hairs, and short regrowing hairs may support the diagnosis.
Are blood tests always required?
No. There is no single blood test that confirms alopecia areata, and extensive laboratory testing is not automatically required for every typical case.
Targeted tests may be considered when symptoms or medical history suggest thyroid disease, anemia, nutritional deficiency, hormonal disease, or another contributor to hair loss.
Is a scalp biopsy always needed?
No. Most typical cases do not require a biopsy.
A dermatologist may consider a biopsy when the diagnosis remains uncertain or when fungal infection, scarring alopecia, another inflammatory disorder, or a different cause of hair loss must be excluded.
Conditions That Can Resemble Alopecia Areata
- Tinea capitis: A fungal scalp infection that may cause scale, broken hairs, tenderness, or swollen lymph nodes.
- Trichotillomania: Repeated hair pulling that commonly produces irregular patches and hairs of different lengths.
- Traction alopecia: Hair loss caused by repeated pulling from tight hairstyles or extensions.
- Telogen effluvium: Increased diffuse shedding, often following illness, surgery, weight loss, childbirth, or another physiological stressor.
- Androgenetic alopecia: Gradual patterned thinning rather than sudden smooth patches.
- Scarring alopecia: Inflammatory hair loss that can permanently destroy follicles.
- Hair-shaft breakage: Hair damage that leaves broken hairs rather than completely empty follicles.
Understanding the underlying cause of thinning or hair loss is necessary before choosing treatment.
Can Alopecia Areata Be Treated?
Yes. Treatment can reduce immune activity and promote regrowth in some patients, but no treatment guarantees permanent regrowth or prevents every future episode.
The appropriate plan depends on age, severity, duration, location of hair loss, nail involvement, medical history, previous treatments, and the effect of the condition on quality of life.
| Treatment | Possible Use | Important Point |
|---|---|---|
| Intralesional corticosteroids | Limited patches, commonly in adults | Administered by a qualified clinician; discomfort and skin thinning can occur |
| Topical corticosteroids | Localized disease, including selected children | Strength, duration, and location require professional guidance |
| Contact immunotherapy | More extensive or persistent alopecia areata | Specialist treatment designed to create a controlled skin reaction |
| Minoxidil | Sometimes used to support or maintain regrowth | Does not treat the underlying autoimmune process |
| JAK inhibitors | Severe or extensive alopecia areata in eligible patients | Prescription systemic medicines requiring screening and monitoring |
| Other systemic medicines | Selected severe, rapidly progressive, or treatment-resistant cases | Benefits, relapse risk, and systemic adverse effects require specialist assessment |
| Cosmetic support | Any severity | Wigs, scalp prostheses, fibers, eyebrow products, and artificial eyelashes can support quality of life |
Corticosteroid Treatment
Corticosteroids reduce inflammation and immune activity around the follicle.
For a small number of patches, a dermatologist may recommend corticosteroid injections into the affected skin. Topical corticosteroids may be considered for localized disease and are often preferred over injections for younger children.
Short courses of systemic corticosteroids are sometimes considered for rapidly progressive or extensive disease. Because systemic treatment can cause significant adverse effects and hair loss may recur after treatment ends, it requires careful medical supervision.
Contact Immunotherapy
Contact immunotherapy uses a specialist-applied chemical to produce a controlled allergic reaction on the skin. The goal is to alter immune activity around affected follicles.
This treatment may be considered for extensive or persistent alopecia areata. It requires repeated clinic visits and can cause redness, itching, blistering, pigment changes, or swollen lymph nodes.
JAK Inhibitors for Severe Alopecia Areata
Janus kinase—or JAK—inhibitors reduce signalling involved in immune-system activity. They have changed the treatment options available for severe alopecia areata.
In the United States, three oral JAK inhibitors have received FDA approval for alopecia areata:
- Baricitinib: Approved for adults with severe alopecia areata.
- Ritlecitinib: Approved for adults and adolescents 12 years and older with severe alopecia areata.
- Deuruxolitinib: Approved for adults with severe alopecia areata.
These medicines are not appropriate for every patient. They can increase the risk of serious infections and have other important warnings and precautions. Screening, vaccination review, laboratory testing, medication review, and continued monitoring may be required.
Patients should discuss infection history, cardiovascular risk, cancer history, blood-clot risk, pregnancy, breastfeeding, and other medicines with the prescriber.
Regrowth varies, and hair loss may return after treatment is discontinued. Treatment should be prescribed and monitored by an appropriately qualified medical professional.
Read more about JAK inhibitors for hair conditions. Despite the older URL wording, these medicines should not be described as a guaranteed cure.
Alopecia Areata in Children
Alopecia areata frequently begins during childhood or adolescence. The diagnosis, amount of hair loss, age, emotional impact, and tolerance for treatment all affect the management plan.
Some children with a small number of patches experience spontaneous regrowth. A dermatologist may recommend observation, topical corticosteroids, or another age-appropriate treatment.
Ritlecitinib is FDA-approved for severe alopecia areata in patients 12 years and older. Other systemic treatments may have different age restrictions or off-label status.
Parents should avoid giving children supplements or applying essential oils, irritants, or unapproved remedies without professional guidance.
Will Hair Grow Back?
Hair can regrow because alopecia areata usually does not permanently destroy the follicle.
Spontaneous regrowth is more likely in people with a small number of recent patches. However, it is impossible to predict the exact course for an individual.
Regrowing hair may initially appear fine, white, or lighter than the surrounding hair. Its usual thickness and color may return over time.
Hair loss can recur after spontaneous regrowth or successful treatment. More extensive disease, long duration, ophiasis-pattern loss, nail involvement, and early childhood onset may be associated with a more persistent course, but none of these factors determines an individual outcome with certainty.
Can Alopecia Areata Permanently Damage Hair Follicles?
Alopecia areata is classified as a non-scarring alopecia. The follicular structures generally remain capable of producing hair.
However, other inflammatory conditions can cause permanent follicular destruction. Burning, substantial pain, pustules, heavy crusting, smooth scar-like skin, or loss of visible follicular openings requires prompt medical evaluation.
General information about hair follicles and hair damage may help explain why follicular hair loss and hair-shaft breakage are not the same problem.
Self-Care and Cosmetic Support
Self-care does not cure the immune disorder, but it can protect exposed skin and reduce the practical impact of hair loss.
- Protect exposed scalp skin with sunscreen, a hat, or another suitable covering.
- Wear glasses or sunglasses if eyebrow or eyelash loss allows more dust and light to reach the eyes.
- Use gentle hair and scalp products if the skin is sensitive.
- Avoid harsh chemicals or aggressive styling that may cause additional breakage.
- Consider wigs, hairpieces, scalp prostheses, fibers, eyebrow products, or artificial eyelashes if desired.
- Seek emotional or mental-health support if hair loss is affecting confidence, relationships, school, work, or daily life.
Resources about reducing hair breakage and keeping hair tools clean may support gentle hair care, but they do not treat alopecia areata itself.
Nutrition and Supplements
No vitamin, mineral, botanical extract, or DHT-blocking supplement has been established as a treatment for the autoimmune process responsible for alopecia areata.
A genuine nutritional deficiency may cause additional shedding or affect normal hair production. Treatment should be directed toward a confirmed deficiency rather than assuming that every case of alopecia areata is nutritional.
Do not delay medical diagnosis while trying supplements, oils, or commercial hair-growth products.
Product information and commercial disclosure
Advanced Trichology DHT Blocker
The original version of this page featured Advanced Trichology DHT Blocker. This dietary supplement is designed for nutritional and botanical support related to androgen pathways.
Alopecia areata is an autoimmune condition, not a DHT-driven form of patterned hair loss. This supplement has not been established as a treatment or cure for alopecia areata and should not replace diagnosis or medical treatment.
Anyone considering a supplement should review the current product label and discuss possible interactions, pregnancy precautions, surgery, medical conditions, and other medicines or supplements with an appropriately qualified professional.
Additional product information is available from Advanced Trichology.
Affiliate and ownership disclosure: Trichology.com may have a commercial relationship with Advanced Trichology and may earn a commission from qualifying purchases. Product availability, formulation, warnings, and prices can change. Review the current label before purchase.
When to Seek Professional Help
Arrange a professional assessment if you notice sudden patches, rapid shedding, eyebrow or eyelash loss, or unexplained diffuse thinning.
Prompt medical evaluation is especially important when hair loss is:
- Rapidly progressing
- Accompanied by pain, burning, swelling, pustules, or crusting
- Producing smooth or scar-like scalp areas
- Associated with substantial scale or broken hairs
- Accompanied by fatigue, weight change, joint symptoms, or other systemic concerns
- Causing eye irritation after eyebrow or eyelash loss
- Significantly affecting emotional well-being or daily life
Read our guide to choosing between a trichologist and dermatologist.
A trichologist can assess and document visible hair and scalp changes. Medical diagnosis, prescription treatment, biopsy, and management of autoimmune or scarring disorders require an appropriately licensed healthcare professional.
Find a Trichologist Near You
Not sure whether your hair loss is alopecia areata, diffuse shedding, breakage, traction, fungal infection, or another condition?
A professional hair and scalp assessment can document the visible pattern and help identify the appropriate next step.
Related Alopecia and Hair-Loss Resources
- Hair-loss conditions
- Diffuse alopecia areata
- Types of alopecia areata
- Alopecia areata in young children
- Hair regrowth after chemotherapy
- Melatonin and hair growth
Frequently Asked Questions About Alopecia Areata
- What is alopecia areata?
- Alopecia areata is an autoimmune disease that commonly causes sudden, smooth patches of hair loss on the scalp, beard, eyebrows, eyelashes, or other parts of the body.
- Is alopecia areata contagious?
- No. Alopecia areata cannot spread from one person to another.
- Does alopecia areata permanently destroy hair follicles?
- Usually not. Alopecia areata is normally non-scarring, which means the follicles generally remain present and may produce hair again.
- What causes alopecia areata?
- It develops when immune activity mistakenly targets hair follicles. Genetic susceptibility and environmental influences are believed to contribute, but the exact cause in an individual is often unknown.
- Can stress cause alopecia areata?
- Some people report stress before an episode, but stress is not considered the sole cause. Alopecia areata develops through an autoimmune process in a susceptible person.
- Can alopecia areata affect eyebrows and eyelashes?
- Yes. It can affect the eyebrows, eyelashes, beard, nostril hair, and other body hair as well as the scalp.
- What is the difference between alopecia areata and alopecia totalis?
- Patchy alopecia areata produces one or more areas of hair loss. Alopecia totalis causes complete or nearly complete loss of scalp hair.
- What is alopecia universalis?
- Alopecia universalis is extensive alopecia areata involving complete or nearly complete loss of scalp, facial, and body hair.
- How is alopecia areata diagnosed?
- Diagnosis is usually based on the history and examination. Trichoscopy can support the diagnosis. Blood tests or scalp biopsy may be used when another condition is suspected, but they are not required in every typical case.
- Can alopecia areata grow back without treatment?
- Yes. Spontaneous regrowth can occur, especially with a small number of recent patches. However, recurrence is possible and individual outcomes cannot be predicted reliably.
- What treatments are available?
- Depending on age and severity, treatment may include corticosteroid injections, topical corticosteroids, contact immunotherapy, minoxidil as supportive treatment, systemic medicines, or an approved JAK inhibitor.
- Are JAK inhibitors approved for alopecia areata?
- Yes. In the United States, baricitinib and deuruxolitinib are approved for adults with severe alopecia areata. Ritlecitinib is approved for adults and adolescents 12 years and older with severe alopecia areata.
- Does a DHT blocker treat alopecia areata?
- No evidence establishes DHT-blocking supplements as treatment for the autoimmune cause of alopecia areata. DHT is principally associated with androgenetic pattern hair loss, which is a different condition.
- Should I see a dermatologist or trichologist?
- A trichologist can assess and document visible hair and scalp changes. A dermatologist is appropriate for medical diagnosis, prescription treatment, biopsy, rapidly progressing loss, or suspected inflammatory, autoimmune, fungal, or scarring disease.
Conclusion
Alopecia areata is an autoimmune, usually non-scarring form of hair loss that commonly produces sudden, smooth patches.
It can affect the scalp, beard, eyebrows, eyelashes, nails, and other body areas. Some people experience spontaneous regrowth, while others develop recurring, persistent, or extensive hair loss.
Treatment may include corticosteroids, contact immunotherapy, supportive minoxidil, systemic medicines, or an approved JAK inhibitor, depending on age, severity, medical history, and individual goals.
Because fungal infection, traction, hair pulling, diffuse shedding, and scarring alopecia can resemble alopecia areata, accurate diagnosis should come before treatment.
References and Further Reading
- National Institute of Arthritis and Musculoskeletal and Skin Diseases: Alopecia Areata.
- American Academy of Dermatology: Alopecia Areata Overview.
- American Academy of Dermatology: Alopecia Areata Signs and Symptoms.
- American Academy of Dermatology: Alopecia Areata Diagnosis and Treatment.
- National Alopecia Areata Foundation: Alopecia Areata.
- Janus Kinase Inhibitors for Alopecia Areata: A Systematic Review and Meta-Analysis. 2023.
- Treatments for Alopecia Areata: A Network Meta-Analysis. 2023.
- Efficacy and Safety of Ritlecitinib in Adolescents With Alopecia Areata. 2023.
- Integrated Safety Analysis of Ritlecitinib in Alopecia Areata. 2024.
Medical disclaimer: This article is for general informational and educational purposes only. It does not provide medical advice, diagnosis, or a personalized recommendation to use a medicine, supplement, topical product, injection, or procedure. Treatment suitability depends on age, diagnosis, severity, pregnancy status, medical history, medicines, infection risk, laboratory results, and other individual factors. Seek prompt medical evaluation for rapidly progressing hair loss, scalp pain, marked inflammation, infection signs, eyebrow or eyelash loss, or smooth scar-like areas.
