April 2019 in “Journal of Investigative Dermatology” Alopecia Areata patients have too many Firmicutes and too few Bacteroides in their gut.
Rosacea may be linked to gut and brain issues, not just a skin problem.
December 2021 in “Revista da Sociedade Portuguesa de Dermatologia e Venereologia” Imbalance in scalp bacteria can affect hair and scalp health, potentially leading to conditions like hair loss, psoriasis, and dandruff.
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January 2021 in “Dermatology and therapy” An imbalance in gut bacteria is linked to skin immune diseases and may affect their outcomes and related health issues.
October 2025 in “Progress In Microbes & Molecular Biology” PCOS is linked to gut bacteria changes, suggesting gut-focused treatments might help.