Additionally, our case shows HLA-Cw1, which is associated with Sweet's disease (SD), especially with neurological involvement. 5 Therefore, given the isolated cutaneous involvement, the pathogenesis of our case may be close to SD, which would also show cutaneous neutrophilic infiltration, although the diagnosis of AA was made based on histological findings of abscesses surrounded by granulomatous reaction in all examined nodules. Steroid therapy is typically required for remission of AA. 1 In contrast, all of the lesions in our case spontaneously regressed, which has not been previously reported. Additionally, our case showed isolated cutaneous involvement, suggesting a non-aggressive form. However, AA sometimes precedes development of systemic diseases and cases involving other organs or development of systemic diseases appearing several years after AA diagnosis have been reported. 1 Moreover, given that our case has HLA-Cw1, significantly associated with neuro-SD, long-term follow up, including neurological as well as intestinal examinations, is necessary.