My son's skin changed before his gut did. Here's what I missed.
# My Son's Skin Changed Before His Gut Did — Here's What I Missed
Crohn's disease is known as a gut condition. But for many people — including my son — the first visible signal isn't a stomach cramp or a bathroom emergency. It's something on the skin. A tender lump on the shin. A wound that won't heal. A rash that appears out of nowhere during a stressful week. If you know what you're looking at, these signs are incredibly useful. If you don't, they're easy to dismiss — and I dismissed them, longer than I should have.
As a naturopath and a Crohn's mum, I want to walk you through what I've learned, so you don't make the same mistake I did.
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## What Are Extraintestinal Manifestations of Crohn's?
Extraintestinal manifestations (EIMs) are symptoms of Crohn's disease that occur outside the digestive tract. According to the Crohn's & Colitis Foundation, up to 40% of people with IBD experience at least one extraintestinal manifestation — and the skin is one of the most common sites.
Key takeaway: Skin symptoms in Crohn's are not a separate condition — they are a direct expression of the same systemic inflammation driving gut disease.
This matters enormously, because it means that when your skin flares, your gut is often not far behind — or already inflamed. The skin becomes a visible window into what's happening internally. For caregivers and patients alike, learning to read that window is a genuine clinical advantage.
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## The 3 Most Common Crohn's Skin Symptoms
### 1. Erythema Nodosum
This is the one I saw on my son first, though I didn't recognise it at the time. Erythema nodosum presents as tender, raised, reddish-purple bumps — most commonly on the shins, but sometimes on the forearms or ankles. They look and feel like deep bruises. They're warm to the touch. And they often appear when gut inflammation is active or escalating.
The Mayo Clinic notes that erythema nodosum is the most common skin manifestation of IBD. It typically tracks with disease activity — meaning when gut inflammation is controlled, these bumps tend to resolve on their own. This is important: it means treating the underlying Crohn's is the primary path forward, not chasing the skin symptom in isolation.
What to do: Photograph it and bring the photos to your gastroenterologist at your next appointment. Note when it appeared in relation to any gut symptoms. This timeline is useful clinical information.
### 2. Pyoderma Gangrenosum
This one is rarer, but more serious, and it's frequently misdiagnosed. Pyoderma gangrenosum starts as a small, painful pustule or red bump — and rapidly ulcerates into a deep, painful wound with a purple-blue border. It most often appears on the legs, but can occur anywhere.
According to the NHS, pyoderma gangrenosum affects approximately 1-2% of people with IBD. What makes it particularly challenging is that it can worsen with certain wound debridement techniques — so getting the right diagnosis before any treatment is critical. A dermatologist experienced with IBD is essential here.
Key takeaway: If you have Crohn's and develop a wound that seems to appear without injury and isn't healing, do not wait. This warrants urgent review by both your gastroenterologist and a dermatologist.
### 3. Perianal Skin Tags and Fissures
This is the symptom people are least likely to mention to their doctor — and the one most likely to be a direct Crohn's signal. Skin tags around the perianal area, fissures, or fistulas in that region are a hallmark of Crohn's disease specifically (as opposed to ulcerative colitis). The Crohn's & Colitis Foundation identifies perianal disease as present in up to 40% of Crohn's patients.
These are not cosmetic. They are not caused by poor hygiene. They are inflammatory, and they deserve to be discussed openly with your gastroenterologist.
What to do: Tell your GI team. There are specific management approaches for perianal Crohn's, including medications and, in some cases, procedures. Staying silent means staying undertreated.
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## What Can You Do Alongside Your Medical Care?
I want to be clear: the primary treatment for Crohn's-related skin symptoms is managing the underlying disease. That's your gastroenterologist's domain, and it's not something to navigate alone or replace with natural approaches.
That said, as a naturopath, here's what I support alongside medical care in our family:
Reducing systemic inflammation through diet. During active disease periods, we focus on foods that don't add to the inflammatory load — low-residue, anti-inflammatory whole foods, avoiding known personal triggers. This isn't a cure. It's reducing the burden.
Supporting skin barrier integrity. Gentle, fragrance-free skincare matters when skin is inflamed. Internally, adequate zinc and omega-3 fatty acids support skin healing — but always check with your medical team before adding supplements, especially if you're on immunosuppressants.
Tracking skin symptoms alongside gut symptoms. I keep a simple log — date, photo, gut symptoms that week, stress levels, sleep. This has been genuinely useful at gastroenterology appointments. It turns subjective experience into data your doctor can use.
Advocating for a dermatology referral. If your gastroenterologist hasn't mentioned a dermatologist, ask. The gut-skin connection in Crohn's is well-established, and co-management between specialties leads to better outcomes.
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## Why Early Recognition Matters
One of my strongest advocacy positions — and this comes from watching my husband navigate Crohn's for decades, including three surgeries — is that early recognition changes outcomes. Not just in the gut. On the skin too.
When my son's skin started changing, I wish I had known to connect those dots sooner. I wish I had photographed the rash and brought it to his gastroenterologist that week, not months later. I wish I had known that his skin was trying to tell us something his gut hadn't said out loud yet.
Now I know. And I want you to know too.
If Crohn's runs in your family, I also want to gently say: early screening matters. Blood tests and fecal calprotectin from as young as age 10 when there's a family history. Skin symptoms included in that conversation. The earlier you catch escalating inflammation, the more options you have.
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## Common Questions
Can skin symptoms appear even when Crohn's seems controlled?
Yes — occasionally skin manifestations can occur even when gut symptoms are quiet, though they more commonly track with active disease. This is another reason to flag skin changes to your gastroenterologist regardless of current gut status.
Should I see a dermatologist or my gastroenterologist first?
Start with your gastroenterologist — they can assess whether the skin symptom is Crohn's-related and refer you to a dermatologist experienced with IBD. A general dermatologist unfamiliar with IBD may miss the connection.
Are Crohn's skin symptoms contagious?
No. Crohn's-related skin manifestations are inflammatory in origin, not infectious. They cannot be passed to others.
Will treating my Crohn's clear up my skin?
For erythema nodosum, usually yes — it tends to resolve as gut inflammation is controlled. For pyoderma gangrenosum, treatment is more complex and requires specialist input. Your medical team is the right guide here.
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This article supports your medical care — it does not replace it. Always work with your gastroenterologist and specialist team.
— Kate, The Crohn's Method