The gut-skin axis refers to the bidirectional relationship between gut microbiome health and skin conditions, mediated through immune signaling, inflammation, and metabolic byproducts.
Gut bacteria produce metabolites (like short-chain fatty acids) that influence systemic inflammation.
An imbalanced gut microbiome (dysbiosis) can increase intestinal permeability (“leaky gut”), letting bacterial byproducts enter circulation and trigger immune responses that show up as skin inflammation
The gut and skin share immune signaling pathways, so gut inflammation can activate mast cells and immune cells that affect skin.
Conditions linked to the skin-but axis: Acne Rosacea Eczema (atopic dermatitis) Psoriasis
What influences it: Diet (fiber, fermented foods, high sugar/processed food intake) Stress (affects gut motility and microbiome composition) Antibiotic use Probiotics/prebiotics — some strains (like *Lactobacillus* and *Bifidobacterium*) show modest benefits for eczema and acne in studies
Diet and gut health are reasonable pieces of a broader approach to chronic skin issues.