Abstract
The skin microbiome plays an important role in maintaining skin homeostasis by controlling inflammation, providing immune education, and maintaining host defense. However, in many inflammatory skin disorders the skin microbiome is disrupted. This dysbiotic community may contribute to disease initiation or exacerbation through the induction of aberrant immune responses in the absence of infection. Hidradenitis Suppurativa (HS) is a complex, multifaceted disease involving the skin, innate and adaptive immunity, microbiota, and environmental stimuli. Herein, we discuss the current state of HS skin microbiome research and how microbiome components may activate pattern recognition receptor (PRR) pathways, metabolite sensing pathways, and antigenic receptors to drive anti-microbial peptide, cytokine, miRNA, and adaptive immune cell responses in HS. We highlight the major open questions that remain to be addressed and how antibiotic therapies for HS likely influence both microbial burden and inflammation. Ultimately, we hypothesize that the two-way communication between the skin microbiome and host immune response in HS skin generates a chronic positive feed-forward loop that perpetuates chronic inflammation, tissue destruction, and disease exacerbation.
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