Hidradenitis suppurativa (HS) has been associated with metabolic syndrome [1-3]. Three large population-based studies showed a significant association of type 2 diabetes mellitus (T2DM) with HS [3-5]. Two meta-analyses found an increased 1.69 to 3 odds of diabetes [6-7]. In the present study, we aimed to compare whether the phenotype and comorbidities of HS patients with T2DM would differ from those without T2DM. We reviewed retrospectively all the patients with HS diagnosis that attended a tertiary care hospital (Department of dermatology, Helsinki University Hospital, Finland) between January and December 2018.