Alopecia aerata and hair loss

What distinguishes alopecia from other hair loss is that it is sudden and totally unpredictable.
The origin of the disorder has become clearer in recent years, and is most likely a autoimmune disease.
Heredity may also play a role: 20% of affected patients have a family history of alopecia.
The stress and/or a vitamin D deficiency could be major aggravating factors.



Fortunately, this is the most common type of hair loss because it is also the most curable. It is defined by sudden hair loss in isolated areas of the scalp, and by the formation of patches completely devoid of hair. The loss is so sudden that the person concerned does not always notice it first: it is often a third party who brings it to their attention. Another feature is the unpredictable nature of this type of hair loss. Often a single plaque appears, sometimes followed by others a few weeks later. Other times, on the contrary, several areas of the scalp become bald at the same time, in a random fashion.

The patches have a rounded shape and develop centrifugally, varying in size from 2 to 8 centimetres in diameter at the end of their development. Another sign is that the hairless areas are often demarcated from the rest of the hair by small broken hairs that are short (1 or 2 cm) and thinning towards the roots. The appearance of these peripheral hairs is reminiscent of an exclamation mark. An expert cannot confuse the patches of alopecia with those of trichotillomania, which present non-smooth surfaces, with traces of plucking and small broken hairs.

In more than 50 % cases, the hair grows back all on their own, between six months and a year after the appearance of the patches, especially in the case of one or two isolated patches. Unfortunately, the quality of regrowth is unpredictable, and it is essential to stimulate it with a suitable treatment as soon as the first symptoms appear (see the Clauderer approach, below). When regrowth does occur, it often goes through an intermediate phase: the hair grows back in the form of white down, then thickens and gradually re-pigments.

Recurrences are frequent and unpredictable: in 50-% of cases, they can reappear 5 or 10 years after the first plaques disappeared, without anyone knowing why.


Much more rarely (5 % of cases), the process of hair loss problems can spread to the entire scalp: this is known as "decalvative" alopecia. Even more rarely (0.20 % of cases), alopecia spreads to the entire hair system and all the hairs on the body fall out: this is "universal" alopecia. The prognosis is more severe for total alopecia. On average, hair returns later and more incompletely: only 15 to 25 % grow back spontaneously. Relapses are also more frequent.


Whether partial or total, alopecia affects both men and women. It particularly affects brown hair and young people (around 60 % of cases occur before the age of 20). The average age is around 30.

Patchy peeling95 % of cases
Decalcifying peel5 % of cases
Universal peel0.20 % of cases
Gender50 % men, 50 % women
Age first event50 % of cases are under 20 years old
Average age 30 years old


Impairment of the hair follicles (small sheaths where the hair roots develop) which suddenly suspend their activity, but are not destroyed. Their cells no longer produce hair keratin but their work is simply blocked, as if ready to go again. As proof of this, the skin of the scalp remains normal, and the hair holes persist - unlike in androgenetic hair loss, where the inactive follicles sink into the dermis and the skin becomes smooth. The reasons for this deficiency are still the subject of three different hypotheses, which are not mutually exclusive: alopecia could be multi-factorial and the combination of three factors could favour its appearance.


A deficiency in the immune system is now considered to be the dominant factor. The argument is based on analysis of the hair follicles affected: they reveal the presence of self-destructive antibodies during the progressive phase of alopecia. These same antibodies disappear during the regrowth phase.

Explanation: The immune system normally generates antibodies that enable any organism to protect itself against external aggression. Here, for some unknown reason, the matrix cells produce antibodies which, far from protecting them, attack their own structure and block the formation of keratinocytes.


Statistics show that people with alopecia are often anxious or psychologically vulnerable. What's more, they have often undergone a major emotional trauma a few months before the first symptoms appear (loss of a loved one, disruption to the pace of life, intense fear, etc.). Is this trauma the direct cause of hair loss? Or did it simply act as a catalyst in the autoimmune mechanism described above? Opinions differ.

In any case, the stress generated by the disease itself has a negative influence on hair loss. It's a well-known fact that the arbitrary and aesthetically disabling nature of the symptoms frequently triggers a state of anxiety that considerably aggravates the condition itself. Supportive psychotherapy is often recommended to try and break this vicious circle. With the advent of the internet, group therapies have become increasingly popular, offering sufferers the chance to trivialise their disability and support each other.


The genetic route should not be overlooked, since cases of alopecia are found in the family histories of 20 % individuals who develop the disease. But the hair loss gene has not yet been isolated.


Is there a correlation between hair loss and vitamin D deficiency? Several studies have already been carried out to clarify this question. The latest two, published in 2014, clearly answer in the affirmative and indicate that all the volunteers with alopecia who took part in these two studies had a significant vitamin D deficiency. The second study, published in June 2014 by the British Association of Dermatologists, also shows that the more severe the hair loss, the greater the vitamin D deficiency.
Association between Vitamin D levels and Alopecia Areata
Vitamin D deficiency in alopecia areata


There is no miracle cure for alopecia. Until its mechanisms are fully understood, no therapy will be able to prevent the onset or recurrence of the disease: alopecia develops and relapses at its own pace, and the many treatments currently available can hasten the re-growth process but have no effect on either the onset or definitive cure of the condition.


An in-depth hair diagnosis, on site (by appointment, by calling 01 42 61 28 01) is necessary to examine your scalp, analyse your hair and determine the stage of the disease.


If you are unable to travel, choose the Remote diagnosis. Thank you for enclose a photo and your telephone number. After analysing your hair, we'll give you a call.

The treatment we may propose may include two serums designed to stimulate hair regrowth.

With no side effects, these serums should be applied every day, following a precise method.

Hair loss is certainly reversible. However, it is extremely difficult, if not impossible, to predict when hair will grow back in the affected areas.

Jean-François Cabos

Jean-François Cabos is the creator of a unique hair care method based on the research he coordinated, which led to the publication of the book "Cheveux, Racines de Vie" with Hélène Clauderer by Robert Laffont (Collection "Réponses/ Santé").

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