Rapidly Progressive Alopecia Universalis After Varicella-Zoster Virus Infection: The Role of Immune Dysregulation and Tofacitinib Treatment

A nine-year-old boy developed alopecia universalis following a severe varicella-zoster virus (VZV) infection, progressing from a small patch of hair loss to complete body hair loss within two months. Treatment with oral tofacitinib led to over 90% hair regrowth in three months and complete regrowth in eight months. The study suggests that VZV can trigger autoimmune diseases like alopecia areata through mechanisms such as molecular mimicry, bystander activation, and epitope spreading. VZV impairs immune function by downregulating immune molecules, facilitating the spread of the virus and potentially leading to autoimmune reactions. The efficacy of JAK inhibitors, including tofacitinib, in treating alopecia areata underscores their potential in modulating immune pathways and promoting hair regrowth.