Beyond eczema: Skin conditions that are often linked to gut health and food reactions
When a child has skin issues, the first thing most parents are told is to try a different moisturiser, use a topical steroid cream or avoid a known allergen. And while that can help, it often doesn't get to the root of the problem. The skin is one of the body's most visible signs that something is going on internally, and in children, it is often connected to gut health, immune function or an underlying food reaction.
When my daughter was little, she had a recurring rash around her mouth that I assumed was eczema. No amount of moisturiser or topical cream made a lasting difference - it was only when we did an elimination diet because the rash wouldn't clear up that we made the connection to salicylates, a natural food chemical found in many foods, including brightly coloured fruits and vegetables.
In clinic I see this regularly - kids with skin symptoms that have been managed topically for long periods of time, with no one having looked deeper. This post is about three skin conditions that many parents may be unfamiliar with - and what they might be telling you about what's going on inside.
The gut-skin connection
The gut and skin are closely linked through the immune system, with approximately 70% of the immune system residing in the gut. When the gut lining is compromised or the microbiome is imbalanced, the immune system becomes overactive, and this often shows up in the skin, through rashes, redness or irritation.
In children, the gut microbiome is still developing, and this makes them particularly vulnerable to skin reactions driven by gut imbalance. This is one of the reasons why skin conditions like eczema and rashes are so common in babies and toddlers, whose gut microbiomes are still being established. Gut dysbiosis (an imbalance of bacteria in the gut) can also drive systemic inflammation, which manifests as skin symptoms in some children.
This is why families often find that topical treatments only provide temporary relief. Until the gut is addressed, the underlying driver remains.
Urticaria (hives)
Urticaria presents as raised, itchy welts on the skin that can appear and disappear quickly, often leaving parents confused about the cause. The most commonly identified triggers are food allergens like nuts, eggs and shellfish, but in children with chronic or recurring hives, it is important to consider less commonly known triggers, such as food additives (artificial colours, preservatives, flavour enhancers), salicylates and other natural food chemicals.
Histamine intolerance is another frequently missed cause of hives, with sensitive children reacting to foods that are either high in histamine - such as Vegemite, tinned tuna or salmon, processed meats, aged cheese, soy sauce and vinegar - or foods that trigger the body to release its own histamine, such as tomatoes and tomato-based products. When the gut is imbalanced, the enzyme that breaks down histamine (DAO) can be compromised, leading to histamine accumulation and making reactions to these foods much more likely.
In clinic, I often find that children with recurring hives have an underlying gut issue that hasn't been investigated, commonly gut dysbiosis and increased intestinal permeability ("leaky gut"). These conditions can drive chronic urticaria by keeping the immune system in a state of constant activation.
Keratosis pilaris
Keratosis pilaris presents as small, rough red or white bumps, typically found on the backs of the upper arms, thighs or cheeks. This common condition - often described as "chicken skin" - is frequently dismissed as purely genetic, but there are also nutritional drivers which are commonly overlooked.
Keratosis pilaris is associated with low vitamin A, a nutrient that is essential for healthy skin cell turnover. Without adequate vitamin A, dead skin cells accumulate around hair follicles, causing the characteristic bumps. Essential fatty acid deficiency (particularly omega-3s) is also commonly linked to keratosis pilaris, as these fats are critical for skin barrier function and reducing inflammation.
The gut connection is also worth considering here, as poor fat absorption is another contributor to this condition. If the gut is not absorbing fats efficiently (which can occur with gut dysbiosis or low digestive enzyme production), vitamin A and essential fatty acids will be poorly absorbed regardless of dietary intake.
Zinc deficiency, associated with gut dysfunction, can further contribute to keratosis pilaris as zinc plays a key role in skin health and repair.
Perioral dermatitis
Perioral dermatitis presents as small red bumps, redness or a rash around the mouth, sometimes extending to the nose or eyes. It is frequently misdiagnosed as eczema or impetigo, and topical treatments often provide only temporary relief because the underlying drivers are not addressed. This is the condition my daughter struggled with when she was younger, and like many people, we thought it was eczema and were confused as to why it didn't respond to topical creams.
Gut dysbiosis is a significant driver of perioral dermatitis, as an imbalanced microbiome can contribute to systemic inflammation that shows up as skin symptoms around the mouth.
Food sensitivities, particularly to salicylates, amines or dairy, are also commonly implicated and worth investigating.
It's important to note that steroid creams, which are commonly prescribed, can actually worsen perioral dermatitis over time and may further disrupt the skin microbiome. If your child has been prescribed a steroid cream with limited results, it may be worth discussing alternative approaches with your GP or seeking a second opinion.
Common dietary patterns across all three conditions
Low dietary diversity - a limited range of foods means a less diverse microbiome and a higher likelihood of nutritional gaps
High intake of ultra-processed foods - these foods are inflammatory and disruptive to the gut microbiome
Inadequate zinc - one of the most common nutritional deficiencies I see in children with skin conditions
Low vitamin A intake or poor fat absorption limiting vitamin A availability
Insufficient omega-3 fatty acids, often due to low oily fish intake and high omega-6 intake from processed foods
Unidentified food sensitivities - particularly to natural food chemicals like salicylates and amines, which are not addressed in standard allergy testing
Low fibre intake, which reduces microbiome diversity and gut lining integrity
What parents can do
If your child is dealing with any of these skin conditions, here are some practical steps you can take while you seek further support.
Keep a food and symptom diary to start identifying patterns and potential triggers - note what your child ate, any environmental factors and when symptoms appear or worsen
Consider trialling a low-salicylate or low-histamine diet under practitioner guidance if you suspect natural food chemicals are a trigger
Support gut health through dietary diversity, reducing ultra-processed foods and including prebiotic and probiotic-rich foods where tolerated
Address nutritional gaps - zinc and vitamin A in particular are worth assessing, either through diet or testing
Include omega-3 rich foods regularly - oily fish, walnuts and flaxseeds support skin barrier function and reduce inflammation
If symptoms are persistent or severe, consider functional testing including a stool microbiome test and nutritional assessment to identify underlying drivers
Be cautious with steroid creams for perioral dermatitis specifically - if they are not working or symptoms keep returning, seek further investigation rather than continuing to apply them
As a clinical nutritionist specialising in children's health, this is exactly the kind of work I do in clinic - identifying dietary triggers, investigating gut health, interpreting functional test results and putting together targeted nutrition plans that get to the root cause rather than just managing the symptoms. If you'd like support for your child, I'd love to help.