Successful treatment of alopecia universalis with abrocitinib: a case report.

Abrocitinib, a highly selective inhibitor of Janus kinase 1 (JAK1), has been approved for the treatment of moderate-to-severe atopic dermatitis (AD). Patients with alopecia universalis (AU) co-morbid with AD receiving abrocitinib achieved clinical remission for both diseases. We report a case of a patient with AU after drug reaction with eosinophilia and systemic symptoms (DRESS) who responded well to abrocitinib therapy at a dose of 100 and 200 mg once daily. In addition, we reviewed cases of alopecia after DRESS and explored the underlying mechanisms for alopecia areata (AA) being an autoimmune sequela. The therapeutic effects of JAK inhibitors for AA may involve downstream cytokines, such as IFN-γ and IL-15. Abrocitinib may be a promising therapeutic option for recalcitrant AU.