The 2026 Global Delphi Consensus on Acne and the Microbiome: Questions Adults With Persistent Acne Can Ask a Dermatologist

The 2026 Global Delphi Consensus on Acne and the Microbiome gives adults with persistent acne clear questions to ask a dermatologist. Published in Pharmaceuticals to combine international expertise on prevention and treatment, it unanimously supports adding microbiome-targeted care to acne management. Here microbiome means the skin and gut microbial communities that influence inflammation, and Delphi consensus means structured expert voting toward agreement.

Persistent acne often continues past the teen years and affects many adult women. American Acne and Rosacea Society guidance reports acne remains common in adult women and declines with age. The Pharmaceuticals Delphi panel agreed by 89% that the microbiome affects severity and that the gut-skin axis directly impacts acne.

Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.

What did the experts agree on?
Why does strain balance matter more than germs?
How much can biotic adjuncts help?
Which questions help most at the visit?
Where do proven treatments still fit?

What did the experts agree on?

The Pharmaceuticals Delphi panel unanimously agreed, at 100%, that microbiome-targeted treatments should be adopted for acne management (Delphi consensus report). The same panel reached 89% agreement that probiotics can improve microbial balance and treatment efficacy. It also reached 89% agreement that prebiotics, probiotics and postbiotics can benefit acne therapy.

Prebiotics feed beneficial microbes, probiotics supply live beneficial strains, and postbiotics provide active microbial products. Adoption means using them alongside proven care, not instead of it. Ask whether your current routine supports balance or works against it.

Why does strain balance matter more than germs?

Journal of the European Academy of Dermatology and Venereology authors describe acne as Cutibacterium acnes strain dysbiosis with loss of phylotype diversity. The problem is overrepresentation of virulent phylotype IA1, rather than simple bacterial overgrowth. Sebum, abnormal keratinization and Th17 inflammation complete the pattern.

That framing shifts the goal from sterilizing skin to restoring balance. Harsh scrubbing, picking and frequent product switching can irritate skin without correcting strain dominance. Ask about gentle cleansing, barrier support and triggers that raise inflammation for you.

How much can biotic adjuncts help?

A 2026 systematic review of 33 studies found biotic adjuncts safe (systematic review of 33 studies). Mean total-lesion reductions were 37.2% for prebiotics, 45.2% for probiotics and 49.5% for postbiotics, versus 37% for controls.

Probiotics currently have the strongest evidence as promising adjuncts, according to the University of Miami review summarized by Medscape (Medscape summary of the Miami review). The same reviewers call for larger standardized randomized trials on formulations, comparative efficacy and durability. Treat biotics as a possible boost with uncertain staying power, not a guaranteed fix.

Which questions help most at the visit?

Bring a short history and ask for a concrete plan with a review date. Use the consensus and trial gaps to focus the discussion.

Bring every cleanser, leave-on product, supplement and prescription with dates used. Note recent antibiotics, birth-control changes, pregnancy plans and gut symptoms. Clear records help the dermatologist match an adjunct to your cause.

Could a probiotic, prebiotic or postbiotic adjunct fit my acne pattern and history?
Which formulation, dose, duration and stop rule do you suggest?
How will we protect skin and gut microbes during antibiotics, retinoids or benzoyl peroxide?
Should diet shifts, gut symptoms, menstrual changes, stress or new products change the plan?
What lesion count, photos or symptom score will show response, and when do we revise?

Where do proven treatments still fit?

The 2024 American Academy of Dermatology acne guidelines strongly recommend benzoyl peroxide, topical retinoids, topical antibiotics, oral doxycycline and oral isotretinoin for severe acne (American Academy of Dermatology guidance summary). The guidelines pair topical antibiotics with benzoyl peroxide and limit antibiotic duration to curb resistance.

That standard still anchors adult care while a biotic plays a supporting role. Ask how to sequence actives, when to step down antibiotics and what maintenance prevents relapse. Bring a full product and prescription list so the dermatologist can spot duplicate antibiotics and set a clear review date.