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Alopecia areata is a relatively common condition which may occur at any age in either sex. The prevalence of Alopecia areata in the UK population is around 0.15%.
It is a non-scaring condition which can affect:
Alopecia areata can be categorized according to extent or pattern of hair loss
The cause is thought to be an autoimmune phenomenon as often; there is a co-existing autoimmune disease e.g. pernicious anaemia, thyroid disorders, vitiligo, diabetes.
There are lymphocytic infiltrates around the follicles, and a high prevalence of autoantibodies and abnormalities on the titres of circulating T lymphocytes (1).