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The Skin Microbiota

The Skin Microbiota

The human skin serves as a complex ecosystem inhabited by a diverse community of microorganisms, including bacteria, fungi, and viruses. This microbiome plays a critical role in maintaining skin health and defending against pathogenic invaders. The composition of microbial communities varies significantly across different regions of the body, influenced primarily by the local levels of moisture and sebum.Regional Variation in Skin MicrobiotaCutibacterium acnes predominantly colonizes sebaceous...

Introduction to the Human Microbiota

Introduction to the Human Microbiota

Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...

Microbiome of the Eye

Microbiome of the Eye

The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...

Development of Human Microbiota

Development of Human Microbiota

The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...

The Oral Microbiota

The Oral Microbiota

The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...

Skin Diseases and Disorders

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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...

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Related Experiment Video

Updated: May 13, 2026

Infecting Mice with Malassezia spp. to Study the Fungus-Host Interaction

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Published on: November 6, 2019

The skin microbiome: current perspectives and future challenges.

Yiyin Erin Chen¹, Hensin Tsao

¹Medical Scientist Training Program, Health Sciences and Technology, Harvard Medical School, Boston, Massachusetts, USA.

Journal of the American Academy of Dermatology

|March 16, 2013

Summary

Skin microbial communities, including bacteria, fungi, and viruses, are diverse and influenced by host and environmental factors. These microbes play a key role in immune modulation and skin health, offering therapeutic potential.

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Area of Science:

Microbiology
Immunology
Dermatology

Background:

The human skin hosts complex microbial communities comprising bacteria, fungi, and viruses.
Microbial composition is influenced by skin properties (e.g., sebum, moisture, temperature), host genetics, and environmental exposures.
Emerging research highlights the significant role of commensal skin microbes in immune system regulation and maintaining epithelial health.

Purpose of the Study:

To explore the diversity of skin microbial ecosystems.
To understand the factors governing microbial colonization on the skin.
To investigate the role of skin microbes in host immunity and epithelial health.

Main Methods:

Utilized metagenomic studies to analyze microbial diversity.
Investigated correlations between skin characteristics and microbial community composition.
Examined microbe-host interactions and their impact on skin health.

Main Results:

Revealed surprising diversity within skin microbial ecosystems.
Identified key factors influencing microbial colonization patterns.
Demonstrated the significant role of commensal organisms in immune modulation.

Conclusions:

Skin microbial communities are complex and dynamic ecosystems.
Understanding these interactions is crucial for deciphering skin disease pathogenesis.
These insights can guide the development of novel therapeutic strategies targeting skin microbiota.