Primary Skin Abscess Microbiota a systematic review.

INTRODUCTION: An abscess is a collection of pus forming a cavity in the tissue, e.g. the skin. They are generally perceived as the result of infection but infection is not mandatory for the diagnosis. Skin abscesses may occur independently (primary) or be part of other diseases such as the recurrent inflammatory skin disease Hidradenitis Suppurativa (HS). HS is non-infectious but nevertheless abscesses are a common differential diagnosis.

AIM: The purpose of this study is to review the microbiome of bacteria positive primary skin-abscesses in order to explore the reported microbiota.

METHODS: EMBASE, MEDLINER and COCHRANE LIBRABRY were searched on 9th of October 2021 for microbiome, skin, and abscesses. Studies with more than 10 patients reporting the microbiome in human skin-abscesses were included and studies with abscess microbiota sampled from HS-patients, microbiota not sampled from skin-abscesses, missing information on microbiome data, sampling bias, studies in other language than English or Danish, reviews and meta-analyses were excluded. In total 11 studies were included for further analysis.

RESULTS: S. aureus dominates the microbiome of bacteria positive primary skin abscesses.

CONCLUSION: S. aureus is likely to dominate the microbiome of bacteria positive primary skin abscesses in contrast to the polymicrobial microbiome of HS.