Medical disclaimer: This page is for information only. It does not constitute medical advice. If you think you have pompholyx or any other skin condition, please consult your GP or a dermatologist.

Pompholyx Causes and Triggers: What Sets Off a Flare?

One of the first things people want to know when they’re diagnosed with pompholyx is: what caused this? The honest answer is that nobody knows exactly what causes pompholyx in the first place. But what we do know a fair bit about is what triggers flares in people who already have the condition. And that knowledge is genuinely useful, because identifying your own triggers is one of the most practical things you can do to get some control over it.

I’ve been trying to work out my own triggers for 40 years. Some are obvious. Some I’m still not sure about. That uncertainty is normal, and I want to be straight with you about what the evidence actually supports and what’s more speculative.

What causes pompholyx in the first place?

The underlying cause of pompholyx is still not fully understood, which is frustrating but true. What’s clear is that people who develop it have a predisposition, most likely genetic, that makes their skin react in this particular way. That predisposition is often linked to an atopic tendency: a family background of eczema, asthma, or hay fever makes pompholyx more likely.

I’m a good example of this. Alongside the pompholyx on my hands, I’ve had mild eczema on my legs for years, around my ankles and behind my knees. It tends to flare when the seasons change. That pattern, pompholyx and eczema appearing in different places in the same person, is common in people with an atopic background. The skin is reacting to its environment in multiple ways, not just one.

Beyond that predisposition, something has to trigger the response. And that’s where triggers come in.

The difference between a cause and a trigger

This distinction is worth spending a moment on, because it changes how you think about managing the condition.

The underlying cause of your pompholyx or dyshidrotic eczema is your genetic predisposition. You can’t change that. It’s part of how your immune system and skin are wired. But what you can influence is what triggers a flare. A trigger is something that activates the condition in someone who is already susceptible. Remove the trigger, and you reduce the frequency and severity of flares, even though you haven’t changed the underlying predisposition.

The same trigger won’t affect everyone with pompholyx. One person’s worst trigger might have no effect on another sufferer at all. This is why advice like “avoid nickel” or “cut out dairy” helps some people enormously and makes no difference to others. It’s also why identifying your own specific triggers matters far more than following a generic list.

The practical implication: you can’t cure your predisposition, but you can learn what sets it off. That’s where the leverage is.

Contact triggers: the most common category

Soaps, detergents, and cleaning products

Frequent exposure to water and detergents is one of the most consistent triggers. Surfactants in washing-up liquid, laundry detergent, and household cleaners strip the skin’s natural protective barrier, making it more reactive. If your dyshidrotic eczema is worse on the dominant hand, or specifically on the palm and fingers you use to handle cleaning products, this is worth examining closely.

Soap itself is a trigger for many people. The skin on the palms is robust but repeated exposure to even mild soap can compromise the barrier over time. This is partly why pompholyx is more common in people whose work involves frequent handwashing or wet work: healthcare workers, hairdressers, caterers, and cleaners.

Perfume and fragrance

Fragrance is one of the most significant contact allergens overall, and it’s relevant to pompholyx in a specific way: it’s not just perfume you spray on your wrists. Fragrance is added to an enormous range of products, including washing-up liquid, laundry detergent, fabric softener, hand cream, soap, shower gel, and cleaning sprays. If you’re reacting to fragrance, the exposure is likely coming from multiple sources, which makes it harder to identify.

Fragrance mix consistently appears as one of the most common allergens identified in patch testing studies of pompholyx sufferers. If you haven’t investigated fragrance as a trigger, it’s worth doing.

Nickel

Around 20% of people with pompholyx have a nickel allergy, and nickel is a well-established trigger. It’s found in coins, jewellery, watch straps, belt buckles, metal buttons, zippers, and phone cases. Contact with nickel-containing objects can trigger or worsen a flare, particularly on the hands.

Nickel is also present in many foods, including wholegrains, nuts, legumes, chocolate, and leafy vegetables. There’s some evidence that dietary nickel can trigger dyshidrotic eczema in people who are nickel-sensitive, though a low-nickel diet is rarely fully effective because nickel is so widely distributed in food.

If you suspect nickel, patch testing can confirm it. A positive result is useful because it gives you something concrete to work with, even if you can’t eliminate nickel contact entirely.

Other metals: cobalt and chromium

Nickel tends to get the most attention but cobalt and chromium are also identified as contact triggers in pompholyx sufferers. Cobalt often appears alongside nickel, both in contact allergen studies and in the objects that contain it. Chromium is found in leather, cement, and some metal alloys. Both can be identified through patch testing.

Rubber and latex

Rubber chemicals and latex are known contact allergens that can trigger hand eczema including pompholyx. If you wear rubber gloves regularly, particularly for cleaning or work, this is worth considering. The irony isn’t lost on most sufferers: the gloves recommended to protect your hands from detergents can themselves be a trigger. If rubber is a problem, cotton-lined or nitrile gloves are the alternative.

Stress: the trigger that isn’t quite what people think

Many people with pompholyx are convinced that stress triggers their flares. I’m one of them. But the relationship is more nuanced than it first appears.

Stress doesn’t cause pompholyx. But it does appear to reduce the body’s ability to manage it. When you’re stressed, run down, or exhausted, your immune system is under pressure. If you have a predisposition to dyshidrotic eczema, that reduced resilience can be enough to tip you into a flare that might not have happened otherwise.

So when someone says stress triggers their pompholyx, they’re describing something real, but the mechanism is indirect. Stress lowers the threshold at which the condition activates, rather than being a direct cause in the way that nickel contact is.

I’ve noticed this in my own experience. Over the years I’ve got much better at managing stress, and there does seem to be a real correlation with fewer and milder flares. That’s not a controlled experiment, and other things have changed too, but it’s consistent enough that I take it seriously.

The practical implication: stress management can genuinely help, even though it won’t prevent flares entirely. And during high-stress periods it’s worth being more careful about your other known triggers, because your skin is more vulnerable.

Seasonal and temperature changes

Many people notice that their pompholyx follows a seasonal pattern, typically worsening in spring and summer. Google search data backs this up: searches for both pompholyx and dyshidrotic eczema peak in spring and early summer, which matches what sufferers report. My own experience fits this too: my worst flares have tended to happen as the weather warms up.

The precise mechanism isn’t fully established, but increased sweating, heat, and humidity are all thought to play a role. Some people find the opposite: their pompholyx is worse in winter, possibly related to dry indoor air, central heating, and cold temperatures affecting the skin barrier.

Changes in temperature, rather than any particular temperature itself, seem to be particularly relevant. The transition from winter to spring appears to trigger flares more reliably than sustained heat or cold alone. If you notice a seasonal pattern in your own flares, that’s useful information and worth recording.

Sweating

For a long time pompholyx was thought to be directly caused by sweat ducts, which is where the name dyshidrotic eczema (bad sweating) comes from. That theory has largely been abandoned: the condition doesn’t originate in the sweat glands. But sweating does still appear to play a role as a trigger, particularly on the palms and soles.

Increased sweating, whether from heat, exercise, or anxiety, can precede or accompany a flare. Some people notice that their hands sweat more immediately before blisters appear. Whether this is a cause or an early symptom of the flare isn’t entirely clear.

Diet: what the evidence actually says

Diet is one of the most frequently discussed pompholyx triggers online, and also one of the most misunderstood.

The honest position is that dietary triggers are rarely the primary cause of pompholyx flares. It is a contact eczema: environmental and contact factors are the dominant triggers for most people. If someone reports that cutting out a particular food improved their dyshidrotic eczema, it’s possible they simultaneously removed some contact trigger without realising it, or that coincidence is involved.

That said, there are specific dietary connections that do have some evidence behind them.

Nickel in food can trigger flares in people who are nickel-sensitive. High-nickel foods include wholegrains, oats, nuts, seeds, chocolate, soy products, and some shellfish. A low-nickel diet is sometimes recommended for confirmed nickel-allergic pompholyx sufferers, though it’s difficult to follow and the evidence for its effectiveness is mixed.

Cobalt is also present in food and can be relevant in the small number of people with confirmed cobalt sensitivity.

Beyond these specific metal sensitivities, the evidence for other dietary triggers is weak. If you’ve found a dietary change that helps you, that’s worth knowing and keeping. But it’s also worth investigating contact triggers through patch testing, because that’s where the evidence is strongest.

Infections

Fungal infections elsewhere on the body, particularly athlete’s foot, can trigger a pompholyx reaction on the hands. This is sometimes called an id reaction or autosensitisation: the immune system reacts to a fungal infection at a distant site, and the reaction manifests as blistering on the hands. It’s a well-documented phenomenon. If you have persistent foot problems alongside your hand pompholyx, it’s worth mentioning both to your doctor.

Bacterial infections can also be relevant, though more commonly as a complication of pompholyx (when blisters become infected) than as a trigger of it.

Other medications and medical factors

Certain medications have been associated with triggering pompholyx, including intravenous immunoglobulin (IVIG) therapy and some immune checkpoint inhibitor drugs used in cancer treatment. Aspirin has been reported as a trigger in some cases. If your pompholyx began or significantly worsened after starting a new medication, it’s worth discussing with your doctor.

How to identify your own triggers

Given how individual trigger patterns are, the most useful thing you can do is try to identify your own. The key is being systematic and observant over time. A few practical approaches:

Keep a flare diary. This is the single most useful thing most people never do. When a flare starts, write down: the date, where on your hands or feet it appeared, what you’ve been in contact with in the past 48 hours, what you’ve eaten, your stress level, the weather, and anything unusual. Do this consistently for two or three months and patterns will emerge that you simply can’t spot from memory. A month of careful logging often reveals more than years of vague recollection. A notes app on your phone works fine.

Patch testing. This is the most reliable way to identify specific contact allergens. A dermatologist applies small amounts of common allergens to your skin and monitors the reactions over several days. It’s not infallible, but it’s the logical starting point because we know dyshidrotic eczema is primarily a contact eczema. If you haven’t had patch testing, ask your GP for a referral to a dermatologist.

Product elimination. If patch testing isn’t immediately available, switching to fragrance-free alternatives for your soaps, detergents, and skin products is a low-risk first step. Fragrance is common enough as a trigger that this is always a reasonable place to start, and the products are widely available.

One change at a time. When trying to identify triggers, change one thing at a time and give it several weeks before drawing conclusions. Changing multiple things simultaneously makes it impossible to know what made the difference.

Frequently asked questions

What next?

If you recognise what’s described on this page, the right first step is to see your GP or a dermatologist. They can confirm the diagnosis, identify possible triggers, and discuss treatment options with you.

This site covers all of those areas in detail. You might find these pages useful next:

What is Pompholyx, Treatments, Living with Pompholyx and Reader Stories.

The information on this page has been researched and written by Andy Brown, who has lived with pompholyx for over 40 years and has been running pompholyx information sites since 2008. It is intended for general information purposes only and does not constitute medical advice. This page has been reviewed for clinical accuracy by [Medical Reviewer Name, Qualifications]. Individual symptoms, causes, and appropriate treatments vary. Always consult a qualified GP or dermatologist for advice specific to your situation. If your skin condition is severe, worsening, or infected, seek medical attention promptly.