RecruitingPhase 2Drug trialA Study for Evaluating Safety & Efficacy of Topical Roflumilast 0.3% Foam in Hidradenitis SuppurativaThis is a phase 2a, open label study. As psoriasis and Hidradenitis Suppurativa (HS) share multiple inflammatory pathways, the investigators hypothesize that the use of topical roflumilast 0.3% foam is a safe and efficacious option as a monotherapy for patients with mild disease and as add-on therapy for maintenance and flares in patients with moderate to severe disease. The study will include correlative analysis to study gene expression profiling before and after therapy.