BACKGROUND: Alopecia areata (AA) occurs with the apparition of asyntomatic non inflamatory alopecia plaques without scars. We distinguish several variants which are divided into two groups: typical forms (AA in single or multiple plaques) and atypical forms (by its presentation, evolution or paradoxical regrowth). OBJETIVES AND METHODS: We describe the cases of AA treated in our Trichology Unit between January 2000 and December 2011. RESULTS: We obtained 488 cases of AA. 114 (23.36%) were unusual form of AA or had paradoxical regrowth. The most common unusual form of AA was sisaipho type (7.37%), followed by AA for black and blonde hair (5.32%), atypical diffuse forms (4.30%), androgenetic alopecia type and (3.89%) and AA rectangular occipital (0.68%). Furthermore, we found nine cases of paradoxical regrowth (1.84%). CONCLUSIONS: Atypical variants of AA in our series are less than 25% of all cases, although it should be noted that since it is a specialized unit, we may be making a selection bias to be more difficult to diagnose cases or poor outcome.
BACKGROUND:Alopecia areata (AA) occurs with the apparition of asyntomatic non inflamatory alopecia plaques without scars. We distinguish several variants which are divided into two groups: typical forms (AA in single or multiple plaques) and atypical forms (by its presentation, evolution or paradoxical regrowth). OBJETIVES AND METHODS: We describe the cases of AA treated in our Trichology Unit between January 2000 and December 2011. RESULTS: We obtained 488 cases of AA. 114 (23.36%) were unusual form of AA or had paradoxical regrowth. The most common unusual form of AA was sisaipho type (7.37%), followed by AA for black and blonde hair (5.32%), atypical diffuse forms (4.30%), androgenetic alopecia type and (3.89%) and AA rectangular occipital (0.68%). Furthermore, we found nine cases of paradoxical regrowth (1.84%). CONCLUSIONS: Atypical variants of AA in our series are less than 25% of all cases, although it should be noted that since it is a specialized unit, we may be making a selection bias to be more difficult to diagnose cases or poor outcome.