Alopecia areata is the loss of some or all of the hair system. If the alopecia areata is in areas, it is called partial alopecia areata. Alopecia areata that wholly affects the hair system (hair, hair, eyelashes, eyebrows) is called alopecia areata.

Hair loss is a normal phenomenon. Each person loses about a hundred hair a day. This corresponds to a small handle. When the hair has finished its cycle, it falls and is replaced by another hair.

In the alopecia areata, this replacement phenomenon does not take place. After a few weeks, the fallen hair gives way to one or more smooth skin patches, often circular (s), like coins.

The causes of alopecia areata are most often psychosomatic. Stress or emotional shock can most often explain the appearance of a blemish. The biological mechanism would be based on inappropriate autoimmune defenses.

Be careful not to confuse alopecia and alopecia. Alopecia is the general term for hair loss (diffuse or localized).

The most common chronic alopecia acquired during life are alopecia and so-called "androgenetic" alopecia, dependent on physiology and age.

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Read also :

> Hair loss: causes and treatments
> Hair loss in women
> Trichotillomania: this mania to tear off the hair

Authors: Ladane Azernour Bonnefoy and Dr Ada Picard.
Expert consultant: Dr. Fran├žoise Le Pallec, dermatologist.

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