The Skin Microenvironment and Staphylococcus Epidermidis: A Comprehensive Overview

Abstract

The human skin microbiome is an extremely diverse and variable environment that plays a critical role in the maintenance of barrier integrity, immune regulation, and protection against disease. Among its many inhabitants, Staphylococcus epidermidis stands out as both a commensal and an opportunistic pathogen, making it extremely relevant in skin microbiome research. This review investigates how factors such as moisture, pH, nutrient availability, and immune activity impact microbial diversity across dry, moist, and sebaceous regions. The dual role of S. epidermidis is explored through its role in immune priming, wound healing, and colonization resistance, alongside its involvement in biofilm formation and skin disorders including atopic dermatitis and rosacea. Emerging in vitro and in vivo skin models are also assessed for their flaws and strengths in replicating human skin conditions. Together, these insights highlight the balance in host-microbe interactions and the areas in current research that need to be further studied.