الفهرس 
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Abstract
Alopecia areata (AA) is a recurrent non-scarring type of hair loss that can affect any hair-bearing area and can manifest in many different patterns. Although it is a benign condition and most patients are asymptomatic, it can cause emotional and psychosocial distress. Its prevalence in the general population is 0.1-0.2%. The lifetime risk of developing AA is estimated to be 1.7% and it is responsible for 0.7-3% of patients seen by dermatologists (Karadag-Köse and Güleç 2012).
Alopecia areata (AA) most often is asymptomatic, but some patients (14%) experience a burning sensation or pruritus in the affected area. The condition usually is localized when it first appears. It appears as a single patch in 80% of the patients, two patches in 2.5% and multiple patches in 7.7%. No correlation exists between the number of patches at onset and subsequent severity. AA can affect any hair-bearing area, and more than one area can be affected at once. Frequency of involvement at particular sites is as follows; scalp (66.8-95%), beard of males (28%), eyebrows (3.8%), and extremities (1.3%) (Bolduc and Elston 2015).