Eosinophilia Versus Atopy as a Predictor of Severe Phenotypes in Alopecia Areata

April 2016 in “ Journal of The American Academy of Dermatology ”

alopecia areata atopy eosinophilia severe hair loss autoimmune disease AA

TLDR Both atopy and eosinophilia are linked to more severe hair loss in people with alopecia areata.

The document presents findings from a study that investigated the relationship between atopy, eosinophilia, and the severity of alopecia areata (AA). The retrospective review included 205 AA patients from the Cleveland Clinic, with 92 (44.9%) having concomitant atopy and 38 (18.5%) being classified as eosinophilic. The study found that eosinophilic patients had 3.70 times higher odds of experiencing severe hair loss compared to age- and gender-matched AA controls, while atopic patients had 2.33 times greater odds of severe disease. These associations remained significant even after adjusting for comorbid autoimmune disease and family history of AA or autoimmune disease. The study concluded that both atopy and eosinophilia are associated with more severe patterns of hair loss in AA patients, suggesting the need for further research to understand whether these are etiopathologic mechanisms or merely accompanying phenomena in severe AA.

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