Different neighborhoods. Different residents.
Skin microbiome research shows that communities vary by body site. A forearm and an armpit do not provide the same environment, and there is no universal microbial census that every person should match.
Your skin is not starting from zero after every wash.
A longitudinal study sampled 17 sites in 12 healthy people over months to years and found considerable persistence of microbial communities and strains. Everyday skin ecosystems can be resilient.
That study did not assign bathing routines, so it cannot certify every cleanser. It does challenge the assumption that ordinary life constantly wipes the skin clean of its resident community.
Products change the environment. Meaning matters.
An 11-person study over nine weeks found different responses to different products. Some increased measured microbial diversity; lotions had little effect on that measure. Simply using fewer products did not predict a more diverse community.
Underarm-product research also found changes in bacterial abundance and composition. Neither experiment established a universally healthier routine. We need symptoms, barrier function, or disease outcomes to tell us whether a measured change is beneficial.
What could “cultivating a good biome” mean?
Our working aim is comfortable, intact skin supported by a routine with a clear purpose. Reducing unnecessary abrasion or irritating products is a practical question worth testing. “Maximize bacteria” or “maximize diversity” is not a demonstrated recipe.
A claim that less washing improves the microbiome needs a comparison group, enough time, and health outcomes. A claim printed on a “microbiome-friendly” product deserves the same scrutiny.
Treat skin as a living ecosystem with a protective barrier. Keep useful hygiene and investigate how much unnecessary disturbance a simpler routine could avoid.
What we still don’t know
No routine here is proven to produce an ideal microbiome for most people. Historical or evolutionary plausibility can inspire a hypothesis; it cannot replace a test of that hypothesis.
Follow the footnotes.
- Topographical and temporal diversity of the human skin microbiomeGrice et al. · Science · 2009. Abstract reviewed.
- Temporal Stability of the Human Skin MicrobiomeOh et al. · Cell · 2016. Full-text summary, results, and discussion reviewed.
- The impact of skin care products on skin chemistry and microbiome dynamicsBouslimani et al. · BMC Biology · 2019. Abstract reviewed.
- The effect of habitual and experimental antiperspirant and deodorant product use on the armpit microbiomeUrban et al. · PeerJ · 2016. Full text reviewed.
- The skin barrier: An extraordinary interface with an exceptional lipid organizationBouwstra et al. · Progress in Lipid Research · 2023. Abstract and author-hosted publication summary reviewed.
- How to safely exfoliate at homeAmerican Academy of Dermatology · 2026. Full guidance reviewed.
These notes explain published evidence; they are not a personalized treatment plan. For ongoing symptoms or changes to prescribed care, talk with a qualified clinician.
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