BY DR KELLY PRICE
The Gut-Skin Connection: Why Eczema, Acne, and Psoriasis May Start in Your Gut
If you’ve struggled with eczema, acne, or psoriasis, you’ve likely tried every cream, ointment, and prescription topical available. But what if the root cause of your skin struggles isn’t on your skin at all? A growing body of research points to a powerful connection between your digestive system and your skin, a relationship we call the gut skin axis.
For those dealing with chronic inflammatory skin conditions, understanding this connection, and the specialty testing that can uncover its imbalances, may be the missing piece of the puzzle.
What Is the Gut-Skin Axis?
The gut skin axis describes the bidirectional communication between your gastrointestinal tract and your skin. Far from being separate systems, these two barrier organs are in constant dialogue through immune pathways, microbial metabolites, and systemic inflammation.
Here’s how it works. Your gut houses trillions of bacteria that perform essential functions, producing short chain fatty acids (SCFAs), regulating immune responses, and maintaining the integrity of your intestinal lining. When this microbial community falls out of balance (a state called dysbiosis), several things happen:
Intestinal permeability increases, allowing bacterial fragments and inflammatory compounds to leak into the bloodstream
Systemic inflammation rises, which can manifest in tissues throughout the body, including the skin
Immune signaling becomes dysregulated, potentially triggering or exacerbating inflammatory skin conditions
Research has consistently linked gut dysbiosis to common inflammatory skin diseases including atopic dermatitis/eczema, psoriasis, rosacea, and acne. The gut microbiota of patients with these conditions often shows reduced diversity, depleted beneficial bacteria, and elevated inflammatory markers.
How Gut Imbalances Show Up as Acne, Eczema, and Psoriasis
The mechanisms connecting gut health to skin conditions are becoming increasingly clear:
For acne: Gut dysbiosis can drive systemic inflammation and influence androgen metabolism. Certain gut bacteria are associated with reduced acne risk, specifically Bifidobacterium, which supports intestinal barrier integrity and helps regulate inflammation. Meanwhile, impaired gut barrier function can allow inflammatory triggers to circulate and stimulate sebaceous glands.
For eczema and atopic dermatitis: Research has identified significant differences in gut microbiota composition between eczema patients and healthy controls. Reduced abundance of Ruminococcaceae, bacteria that produce protective short chain fatty acids, is consistently observed. These SCFAs normally help modulate immune responses, and their depletion may leave the skin more vulnerable to inflammation.
For psoriasis: The relationship between gut health and psoriasis is so well established that researchers have identified shared inflammatory pathways between psoriasis and Crohn’s disease, an inflammatory bowel condition. Both conditions involve TNF α and IL 23 centered immune pathways, suggesting that gut driven inflammation can directly influence psoriatic skin lesions.
Why Creams and Prescriptions Often Miss the Root Cause
Most conventional treatments for inflammatory skin conditions focus on suppressing symptoms, topical steroids to calm inflammation, antibiotics to reduce skin bacteria, or immunosuppressants to dampen immune activity. While these approaches can provide relief, they don’t address why the inflammation started in the first place.
If your skin condition improves with antibiotics or topical steroids, that tells us inflammation is driving the problem. But it doesn’t tell us what’s fueling that inflammation. That’s where specialty testing comes in.
GI-MAP Stool Test: Uncovering the Gut’s Role in Skin Inflammation
The GI MAP (Gastrointestinal Microbial Assay Plus) is a comprehensive stool test that uses DNA PCR technology to quantitatively assess your gut microbiome. Unlike older culture based stool tests, the GI MAP can detect strict anaerobes, viruses, and virulence factors, and it provides actual levels of organisms, not just presence or absence.
The GI MAP can reveal:
Inflammatory markers: Calprotectin (a neutrophil driven inflammation marker) and eosinophil activation protein can indicate active inflammation in the gut that may be contributing to systemic inflammation affecting the skin.
Intestinal permeability markers: Zonulin is an add-on in the panel, and elevated levels suggest a “leaky gut” that allows inflammatory compounds to escape into circulation.
Dysbiotic bacteria: The test identifies opportunistic and inflammatory bacteria that may be disrupting normal immune function, including Klebsiella and other microbes that can confuse the immune system.
Beneficial bacteria: The GI MAP also measures your levels of health promoting bacteria that are essential for skin health. When these beneficial populations are depleted, the gut loses much of its natural anti-inflammatory capacity, which can directly translate to worsening skin symptoms.
Knowing your levels of these protective bacteria allows for targeted strategies to rebuild them through specific probiotics, prebiotic, and dietary interventions.
Secretory IgA: This marker reflects gut immune function and barrier health. Low SIgA suggests compromised mucosal immunity.
Digestion and absorption markers: Pancreatic elastase and steatocrit reveal whether you’re properly breaking down and absorbing nutrients essential for skin health.
DUTCH Hormone Test: The Hormonal Drivers of Acne and Skin Conditions
While gut health explains a great deal about inflammatory skin conditions, hormones play an equally important role, particularly for acne, which is often androgen driven. The DUTCH (Dried Urine Test for Comprehensive Hormones) provides a comprehensive evaluation of sex and adrenal hormones, including their metabolites.
For skin conditions, the DUTCH test offers critical insights:
Androgen metabolism: The test measures testosterone, DHEA, and their metabolites including 5a DHT and 5a androstanediol. DHT is three times more potent than testosterone at the androgen receptor and directly contributes to cystic acne development. The DUTCH test can show not just how much androgen you have, but how your body is metabolizing it, whether into more or less androgenic forms.
Estrogen metabolism: For women whose skin conditions fluctuate with their menstrual cycle, the DUTCH test reveals estrogen and progesterone balance along with estrogen detoxification pathways. When estrogen and progesterone are low (as they are during menstruation), androgens have relatively free rein at the receptor, which is why many women experience cyclical breakouts.
Estrogen dominance or impaired estrogen clearance can also directly worsen histamine burden. Since histamine triggers itching, flushing, and skin inflammation, this provides another mechanism linking hormonal imbalance to conditions like eczema, acne, and hives.
Cortisol patterns: Stress directly impacts skin health through cortisol and DHEA. Chronic stress can elevate DHEA (an androgen precursor), driving acne, while dysregulated cortisol affects immune function and skin barrier repair.
Methylation and Dexoification: One of the most valuable insights the DUTCH test provides is a window into your methylation pathways, which play a central role in how your body clears hormones and toxins. This matters enormously for skin health because when hormone detoxification stalls, inflammatory metabolites can accumulate and circulate.
Inflammatory markers: The DUTCH test includes organic acid markers related to inflammation, providing a window into systemic inflammatory burden.
The DUTCH test is particularly valuable for acne patients whose standard hormone panels come back “normal.” It reveals tissue level hormone activity and metabolism, information that serum testing simply cannot provide.
A Root-Cause Approach to Healing Your Skin Naturally
Rather than treating skin conditions as isolated dermatological problems, specialty testing allows a more complete picture:
Identify the source of inflammation through GI MAP, whether it is dysbiosis, intestinal permeability, pathogenic overgrowth, or immune dysregulation
Uncover hormonal drivers through DUTCH, including androgen excess, cortisol dysregulation, estrogen imbalance, and methylation capacity
Create targeted interventions based on actual data, not guesswork
This approach doesn’t mean abandoning conventional dermatological care. Topical treatments can still be valuable for managing symptoms while underlying drivers are addressed. But by investigating the gut and hormonal roots, it becomes possible to move beyond symptom management toward lasting resolution.
Healing Your Skin From the Inside Out
Your skin is not an isolated organ. It’s in constant communication with your gut and endocrine systems, and when those systems fall out of balance, the skin often pays the price.
For those struggling with persistent acne, eczema, rosacea or psoriasis, specialty testing like the GI MAP and DUTCH test offers a way to finally understand why, and to develop a personalized plan that addresses the root causes rather than just the visible symptoms.
If you’ve been treating your skin without looking deeper, it may be time to ask, what is your skin trying to tell you about your health?
If your skin has been asking for more than another cream, our naturopathic doctors can help you look beneath the surface and build a personalized plan to help you feel like yourself again.