The commonest presentation of alopecia areata is appearance of bald patches on the scalp. In most cases, hair falls out in small, round patches about the size of a small coin. The patient may have single or multiple such patches. In some cases these patches may remain static, whereas in some cases the patches may spread to involve larger areas of the scalp. In some cases, hair loss is more extensive. Although it is not very common, the disease can progress to cause total loss of hair on the head (alopecia areata totalis) or complete loss of hair on the head, face, and rest of the body (alopecia areata universalis).
===Types of Alopecia areata===
* Alopecia areata monolocularis : In this condition there is a single bald spot on the scalp.
* Alopecia areata multilocularis: In this condition there are multiple bald spot on the scalp.
* Alopecia areata totalis : In this condition, the patient loses all the hair on the scalp.
* Alopecia areata universalis : In this condition, all body hair, including pubic hair, is lost.
* Alopecia areata barbae : In this condition, the disease is limited only to the beard region.
* Traction alopecia : In this condition, alopecia develops along the frontal margins and temporal margins of the scalp due to constant tension on the hair from being tied very tightly.
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