Alopecia areata is a common autoimmune skin disease characterized by hair loss on the scalp, face, and sometimes other areas of the body, such as the underarms or legs. The term "alopecia" means bald, while "areata" means patchy, aptly describing the condition's most common presentation. It's a surprisingly common disease; About 2% of people across the world will experience alopecia areata at some point. They either currently have alopecia areata, they have had it, or they will develop it.
Alopecia areata (AA), also known as spot baldness, is a condition in which hair is lost from some or all areas of the body. It often results in a few bald spots on the scalp, each about the size of a coin. In some cases, the hair loss may progress to involve the entire scalp (alopecia totalis) or the entire body (alopecia universalis).
Alopecia areata is considered an autoimmune disorder. In this type of disease, the body's immune system mistakenly attacks its own tissues. In the case of alopecia areata, the immune system targets hair follicles, leading to inflammation and subsequent hair loss. T-cells swarm the roots, killing the follicle. Hair follicles in a normal state are thought to be kept secure from the immune system, a phenomenon called immune privilege.
Alopecia areata is a polygenic disease, meaning it is related to multiple genetic factors. About 20% of people with alopecia areata have at least one family member who also has the disease. Strong evidence of genetic association with increased risk for alopecia areata was found by studying families with two or more affected members. In 2010, a genome-wide association study was completed that identified 129 single nucleotide polymorphisms that were associated with alopecia areata. controlling the activation and proliferation of regulatory T cells, cytotoxic T lymphocyte-associated antigen 4, interleukin-2, interleukin-2 receptor A, and Eos (also known as Ikaros family zinc finger 4), as well as the human leukocyte antigen.
While the exact triggers of alopecia areata are not fully understood, researchers believe that a combination of genetic predisposition and environmental factors may be involved. Psychological stress and illness are possible factors in bringing on alopecia areata in individuals at risk, but in most cases there is no obvious trigger.
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There is emerging evidence suggesting a possible link between AA and vaccinations, including influenza, zoster, and human papillomavirus (HPV) vaccines. One possible explanation is that vaccinations could trigger immune system activation, which has been observed to exacerbate preexisting autoimmune or autoinflammatory conditions in at-risk populations. A small study observed hair loss exacerbation in three patients following COVID-19 mRNA vaccinations (Pfizer-BioNTech and Moderna). These patients, who were younger on average (30.6 years) compared to unaffected individuals (37.2 years), experienced worsening hair loss within two weeks post-vaccination. Similar cases have been reported with the AstraZeneca and Johnson & Johnson COVID-19 vaccines. However, AA flares have also been linked to SARS-CoV-2 infection, either as an exacerbation of preexisting disease or a new diagnosis. In the study's non-vaccinated AA cohort, the only observed case of hair loss worsening occurred after a COVID-19 infection.
Alopecia areata affects people of all ages, genders, and racial and ethnic groups. Although alopecia areata can begin at any age, most individuals develop the disease early in life. More than 80% show signs of the disease before age 40, and 40% experience symptoms by age 20. Research suggests that women are more likely to develop alopecia areata than men and people of some races and ethnicities may have a higher chance of developing the disease. Parenting a child with the disease can be challenging.
Alopecia areata often appears suddenly, with one or more well-defined round or oval patches of hair loss. Typical first symptoms of alopecia areata are small bald patches. The underlying skin is unscarred and looks superficially normal. Although these patches can take many shapes, they are usually round or oval. Alopecia areata most often affects the scalp and beard, but may occur on any part of the body with hair. Different areas of the skin may exhibit hair loss and regrowth at the same time. The disease may also go into remission for a time, or may be permanent.
Alopecia areata is usually a clinical diagnosis, based on the pattern and history of the hair loss. In addition, your doctor will want to take a family history and your medical history to rule out other things that could cause hair loss. Rarely, a skin biopsy may be needed to confirm the diagnosis. Trichoscopy may aid in establishing the diagnosis. Oftentimes, however, discrete areas of hair loss surrounded by exclamation mark hairs is sufficient for clinical diagnosis of alopecia areata. A biopsy is rarely needed to make the diagnosis or aid in the management of alopecia areata. Histologic findings may include peribulbar lymphocytic infiltration resembling a "swarm of bees", a shift in the anagen-to-telogen ratio towards telogen, and dilated follicular infundibulae. Other helpful findings can include pigment incontinence in the hair bulb and follicular stelae.
It’s not uncommon for someone to have more than one autoimmune disease at the same time, and alopecia areata often occurs with other autoimmune conditions. Because AA is an autoimmune condition, it is not surprising that it may be associated with other immune-driven conditions such as vitiligo, autoimmune hemolytic anemia, celiac disease, lupus, allergic rhinitis, asthma, atopic dermatitis, and thyroid diseases.
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Having alopecia areata can be frustrating and emotionally challenging because hair loss and regrowth are unpredictable. AA frequently causes psychological and emotional distress and can negatively impact people's self-esteem. Children may experience teasing or bullying by their peers. Parents may experience a wide range of emotions, including fear, anger, frustration, sadness and guilt.
Different people have different ways of coping with their hair loss. Some wear wigs or use camouflage techniques to hide the bald areas, while others don’t bother hiding it at all. Children may benefit from camouflage techniques, including special hairstyles, headbands, scarves and hats. More severely affected children may want to consider a hairpiece.
The course of alopecia areata is chronic and difficult to predict. The objective assessment of treatment efficacy is very difficult and spontaneous remission is unpredictable, but if the affected area is patchy, the hair may regrow spontaneously in many cases. The natural course of AA is unpredictable; however, most people with AA achieve hair regrowth within a few years. Regrowth is most likely to occur in patients with milder hair loss. The most important indicators for prognosis are the extent of hair loss and the age when AA starts. People who develop AA at a younger age usually have the worst outcomes.
Before treatment is started, it is essential to have realistic expectations, and to know that at this time there is no cure for AA and that the goals of treatment are to suppress hair loss and promote regrowth. None of the existing therapeutic options are curative or preventive.
The most commonly employed treatment for limited involvement is application of topical steroids. The first treatment choice for patients with limited, patchy AA is topical steroids (applied at home by the patient) or locally injected steroids (applied by the doctor), because of the minimal side effects, ease of application, and excellent response in most low-severity cases. Intradermal steroid injections may also be used, but generally have limited efficacy and are too uncomfortable for most children to tolerate. A 2020 systematic review showed greater than 50% hair regrowth in 80.9% of patients treated with 5 mg/mL triamcinolone injections. In cases of severe hair loss, limited success has been achieved by using the corticosteroid medications clobetasol or fluocinonide as an injection or cream. Application of corticosteroid creams to the affected skin is less effective and takes longer to produce results. Steroid injections are commonly used in sites where the areas of hair loss on the head are small or especially where eyebrow hair has been lost. Whether they are effective is uncertain. Topical corticosteroids frequently fail to enter the skin deeply enough to affect the hair bulbs, which are the treatment target, and small lesions typically also regrow spontaneously.
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Another topical therapy includes minoxidil, anthralin, and a variety of chemicals known as “contact sensitizers” that may stimulate hair growth via poorly understood effects on local immune cells. A Cochrane-style systematic review published in 2019 showed 5% topical minoxidil was more than eight times more associated with >50% hair regrowth at 6 months compared to placebo.
Occasionally, specific topical irritating medications are applied to the scalp to try to reset the autoimmune process and regrow hair. For rapidly progressing or more widespread alopecia, systemic steroids or other immunosuppressants can be used. Excimer laser therapy has shown some efficacy, but is not yet widely available and is expensive. Some other medications that have been used are minoxidil, Elocon (mometasone) ointment (steroid cream), irritants (anthralin or topical coal tar), and topical immunotherapy ciclosporin, sometimes in different combinations.
Recently, a newer class of medications called JAK inhibitors has shown promise at improving even advanced AA, but there has been a high relapse rate if treatment is stopped.
Fecal matter transplants (FMT) have been shown to reverse AA and support hair growth, with long lasting results, even going as far as growing additional hair on arms and face while grey hairs even regained colour. Hair transplantation may be an alternative for patients with chronic local alopecia areata. The fact that the disease is autoimmune and progresses with relapses is one of the biggest question marks before surgery. There have been case reports in the literature since the early 2000s. However, in an article published long-term follow-up; It is reported that the hair transplanted to the eyebrow area falls out again due to the recurrence of the disease. A similar situation was not mentioned in previous studies on this subject.
While medical treatments are crucial, addressing lifestyle factors that can trigger or worsen alopecia areata is equally important. Stress, in particular, is known to exacerbate autoimmune conditions.
Family and patient education, as well as psychological support, are essential in the management of AA. Psychological support and counseling are available and are often helpful. The National Alopecia Areata Foundation and the Children’s Alopecia Project (CAP) are national organizations dedicated to raising awareness of alopecia areata and providing support for affected children and their families.
Alopecia areata is a complex condition with unpredictable hair loss and regrowth patterns. While there is no cure, various treatments can help manage the condition and promote hair regrowth. Early intervention, psychological support, and lifestyle adjustments can significantly improve the quality of life for individuals with alopecia areata.
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