Skin Atlas
Definition & Application
An archive of mapped terms.
Classified within the context of modern skincare.
Skin Microbiome: What it is, how it works, and how to protect it
The skin microbiome refers to the totality of microorganisms living in symbiosis with human skin. An intact microbial balance protects against harmful substances, stabilizes the pH value, and is an essential factor in modern skincare. On healthy skin, up to one million microorganisms exist per square centimeter.
TABLE OF CONTENTS
What is the skin microbiome?
On healthy skin, up to one million microorganisms exist per square centimeter. Dominant genera include Staphylococcus epidermidis, Cutibacterium acnes, and Corynebacterium. These form an ecological balance that depends on moisture, temperature, sebum production, and pH value. If this balance is disturbed, irritation, dryness, or acne can occur.
How does the microbiome affect the skin?
The microbiome works closely with the lipid barrier. It helps produce antimicrobial peptides and strengthens the skin's natural immune defense. If the barrier is weakened, the microorganisms lose their balance. According to Byrd et al. (2022), disrupted microbiome diversity increases skin sensitivity and its tendency to inflammation.
An intact skin microbiome performs several protective functions simultaneously:
- Protection against pathogenic germs through competition for nutrients and binding sites
- Stabilization of the pH value in the slightly acidic range (pH 4.5–5.5)
- Support of the barrier function through antimicrobial metabolic products
- Regulation of inflammatory processes and strengthening of the immune response
A balanced microbiome is not a byproduct of healthy skin – it is one of the conditions for it.
Microbiome-friendly care
Skincare products and cleansers directly influence the microbiome. Aggressive surfactants, alcohol, and synthetic fragrances can damage the protective microflora. For a microbiome-friendly routine, the following are recommended:
- Gentle cleansing with pH-neutral or slightly acidic products
- Avoidance of alcohol and synthetic fragrances
- Moisturizing lipids such as squalane as a supplement
- Regular incorporation of probiotic or prebiotic active ingredients
Environmental factors such as UV radiation and air pollution, as well as influences such as diet, stress, and sleep, also affect the microbial diversity of the skin.
Combination with other active ingredients
Probiotic cosmetics contain inactive microorganisms or their metabolites and thus support the natural flora. Prebiotic formulations provide nutrients such as inulin or alpha-glucan oligosaccharides, which specifically promote beneficial skin bacteria. Both approaches, according to Lee et al. (2022), improve barrier function in clinical studies and can reduce skin redness. Skincare oils with bioactive phytosterols and lipids also create a stable environment for the microbiome without disturbing the natural bacterial diversity.
Who is microbiome care suitable for?
Microbiome-friendly care is beneficial for all skin types, but especially for sensitive skin prone to redness, skin with acne, eczema, or rosacea, as well as dry or dehydrated skin with a weakened barrier. A diet rich in fiber and polyphenols – for example, with green tea, berries, or fermented foods – can additionally support the skin microbiome. The so-called gut-skin axis describes the close connection between gut flora and microbial skin balance.
Frequently Asked Questions about the Skin Microbiome
How does pH value affect the skin microbiome?
A slightly acidic skin environment with pH 4.5–5.5 promotes beneficial bacteria like Staphylococcus epidermidis and inhibits harmful germs. Products with too high a pH value disrupt this balance and can permanently weaken the microflora.
What particularly harms the skin microbiome?
Aggressive cleansers with strong surfactants, alcohol, and synthetic fragrances are most damaging to the natural microflora. Excessive washing, UV exposure, and chronic stress also negatively affect the microbial diversity of the skin.
Does probiotic care help the skin microbiome?
Probiotic cosmetics can support the skin microbiome by providing beneficial bacterial strains or their metabolites. In combination with prebiotic ingredients like inulin, the diversity of the skin flora is promoted, and the barrier function is strengthened.
Conclusion
The skin microbiome is a complex but essential ecosystem of the skin. Gentle, microbiome-friendly products support the natural barrier and help maintain a stable microbial balance – a central component of modern and effective skincare.
References
- Byrd AL et al. (2022): Cutaneous Microbiome and Barrier Interaction – J Invest Dermatol
- Lee H et al. (2022): Prebiotics and Probiotics in Cosmetics – Front Microbiol
- Nakatsuji T et al. (2021): Antimicrobial Peptides and Microbiome Equilibrium – J Invest Dermatol
- Front Cell Infect Microbiol (2023): Gut-Skin Axis and Microbiome Health Review
