What are the most common eczema triggers?

The most common triggers are heat and sweat, dryness and a weakened skin barrier, irritating fabrics, harsh soaps, laundry residue, weather changes, stress, and illness. Food is a trigger for a minority. Most flares involve several of these stacking up together rather than a single cause.

Why does my child's eczema flare up for no reason?

It rarely has no reason, but the reason is often a combination rather than one obvious culprit. A hot day, a scratchy top, a stressful week, and slightly dry skin can add up to a flare when none of them alone would. Looking for stacking triggers, rather than a single villain, usually reveals the pattern.

Can stress cause eczema to flare up?

Yes. Stress is a well-recognised trigger for eczema in both children and adults, and being unwell or run down has a similar effect. This is a genuine physiological response, not imagination. It is also why flares often appear around big changes, illness, or exhausting periods.

How do I identify my child's specific triggers?

Get skin care consistent first, then keep a simple diary of skin alongside weather, clothing, food, illness, and stress, and change only one thing at a time so you can tell what made a difference. Look for patterns over weeks. For suspected food allergy or severe flaring, involve a health professional.

Is eczema caused by something I did?

No. Eczema is driven by genetics and skin-barrier and immune function, not by anything a parent did or did not do. Triggers make existing eczema flare, but they do not cause the underlying condition. You did not give your child eczema, and managing triggers is about comfort, not blame.

What Causes Eczema Flare-Ups? The Complete Trigger Guide

By Kelly Northey, Certified Postpartum Nutrition Professional

Founder of Nella Vosk • 14+ years supporting families across motherhood, feeding, and early childhood wellbeing

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What Causes Eczema Flare-Ups? The Complete Trigger Guide

You have probably played detective more times than you can count. The skin flares, and you rack your brain: was it the new wash powder? The heat? Something they ate? The stress of a big week? You change the one thing you can think of, and sometimes it helps, and sometimes it does not, and you are never quite sure why.

After more than 16 years supporting Australian families through eczema, I can tell you the single most freeing thing to understand about triggers, and it is this: it is almost never just one thing. Once you stop hunting for the one villain and start seeing eczema as a barrier that tips over when enough triggers stack up at once, the whole picture makes more sense, and it gets easier to manage.

This is the umbrella guide to eczema triggers within the Skin/Sensory & Regulation pillar of the Nella Vosk CARE SYSTEM, alongside our Complete Guide to Eczema-Friendly Clothing: Fabrics, Fit & Science for Australian Families. It answers one focused question: what makes eczema flare, and how do you work out your child’s triggers without losing your mind?

The reframe that changes everything: most parents blame whatever changed most recently, the new detergent, yesterday’s meal, so they swap it out and wait. But eczema skin has a lowered threshold. It usually flares when several triggers stack up together, heat plus a scratchy fabric plus a stressful day plus dry skin, not because of one culprit. That is why chasing a single villain so often fails. The real goal is fewer triggers overall and a stronger barrier, so the skin can tolerate more before it tips over.

The common eczema triggers, grouped

Here are the trigger categories worth knowing. Some will matter for your child and some will not. Think of it as a checklist to work through, not a list to fear.

Heat and sweat

One of the most reliable triggers there is, and one of the hardest to avoid in the Australian climate. Overheating and the salt in sweat both irritate the barrier. Keeping skin cool and dressing in breathable layers helps enormously. Our guide on why sweat aggravates eczema goes into the detail.

Irritating fabrics and clothing

Rough seams, tags, wool, and synthetic fabrics that trap heat all rub and irritate. Even the dyes and chemical finishes in new clothes can flare sensitive skin. Our guide to hidden clothing irritants covers what to look for, and the Complete Guide to Eczema-Friendly Clothing: Fabrics, Fit & Science for Australian Families has the full fabric picture.

Laundry products and residue

Detergent residue and fabric softeners are among the most overlooked triggers, because the clothing looks clean but carries a chemical coating against the skin all day. Our guides to the best eczema-safe laundry detergents and why fabric softener causes flare-ups walk through it.

Dryness and a weakened barrier

The foundation trigger under all the others. When skin is dry, the barrier is compromised and everything else irritates it more easily. Consistent, generous moisturising is the single most protective daily habit, because it raises the threshold at which all the other triggers cause a flare.

Soaps, washes, and skincare

Harsh soaps, bubble baths, fragranced washes, and even some moisturisers strip or irritate the barrier. Lukewarm water, soap-free cleansers, and plain fragrance-free products are gentler. Hot water in particular feels soothing for a moment and then makes things worse.

Weather and environment

Cold, dry air and indoor heating in winter dry the skin out; heat and humidity in summer drive sweat. Dust mites, pollen, and pet dander are environmental triggers for some children. You cannot control the weather, but you can adjust clothing, moisturising, and the home environment around it.

Stress and illness

Stress genuinely worsens eczema, in children and adults, and so does being run down or unwell. This is not imagined, and it is not anyone’s fault. It is also why flares often cluster around big life changes, illness, or exhausting periods.

Teething (in babies)

Parents often notice flares during teething, largely because of the constant dribble sitting on the skin around the mouth and chin, plus the stress and disrupted sleep. Our look at eczema and teething explains the link.

Food (for a minority)

In some children, particularly younger babies with moderate to severe eczema, food can play a role, though far less often than people assume, and it needs proper investigation rather than guesswork. Our honest guide to eczema and food triggers explains what the evidence says and how to investigate safely.

How to work out your child’s triggers

Strengthen the barrier first. Get moisturising and gentle skin care consistent before hunting triggers, because it raises the threshold and reduces background flaring.
Keep a simple diary. Note the skin alongside weather, clothing, food, illness, and stressful days. Look for patterns over weeks, not single incidents.
Change one thing at a time. If you swap five things at once and the skin improves, you learn nothing. Change one, give it a few weeks, then judge.
Expect a stack, not a single cause. When a flare comes, ask what several things lined up, not which one thing to blame.
Get help for the big questions. For suspected food allergy or persistent, severe flaring, involve your GP, dermatologist, or dietitian rather than experimenting alone.

Protect the skin while you play detective

Working out triggers takes time, and in the meantime the skin still needs protecting, especially overnight, when scratching quietly undoes your daytime care. Covered hands and smooth, cool sleepwear interrupt the itch-scratch cycle so the barrier can hold while you investigate. Our eczema scratch sleeves and mittens are designed to do exactly that. They do not remove triggers, but they buy the skin some protected time while you find and reduce yours.

And once a flare is underway, our eczema flare-up action plan walks through what to do to settle it.

Want to Explore Bamboo Clothing for Eczema?

Frequently Asked Questions

: The most common triggers are heat and sweat, dryness and a weakened skin barrier, irritating fabrics, harsh soaps, laundry residue, weather changes, stress, and illness. Food is a trigger for a minority. Most flares involve several of these stacking up together rather than a single cause.
: It rarely has no reason, but the reason is often a combination rather than one obvious culprit. A hot day, a scratchy top, a stressful week, and slightly dry skin can add up to a flare when none of them alone would. Looking for stacking triggers, rather than a single villain, usually reveals the pattern.
: Yes. Stress is a well-recognised trigger for eczema in both children and adults, and being unwell or run down has a similar effect. This is a genuine physiological response, not imagination. It is also why flares often appear around big changes, illness, or exhausting periods.
: Get skin care consistent first, then keep a simple diary of skin alongside weather, clothing, food, illness, and stress, and change only one thing at a time so you can tell what made a difference. Look for patterns over weeks. For suspected food allergy or severe flaring, involve a health professional.
: No. Eczema is driven by genetics and skin-barrier and immune function, not by anything a parent did or did not do. Triggers make existing eczema flare, but they do not cause the underlying condition. You did not give your child eczema, and managing triggers is about comfort, not blame.

Next Steps

Strengthen the barrier, watch for stacking triggers rather than single villains, and change one thing at a time. When a flare does come, our eczema flare-up action plan tells you what to do, and for the full clothing-and-fabric picture, head to our Complete Guide to Eczema-Friendly Clothing: Fabrics, Fit & Science for Australian Families.

You are not a bad detective for not cracking it instantly. Eczema is genuinely complicated, and understanding that it is a stack, not a single cause, is the thing that finally makes it manageable.

Kelly x

About the Author

Written by Kelly Northey, Certified Postpartum Nutrition Professional and founder of Nella Vosk.

Kelly founded Bamboo Bubby more than 16 years ago after her own child’s eczema, and has spent the years since helping Australian families interrupt the itch-scratch cycle and find gentle, practical relief for sensitive and eczema-prone skin.