Understanding Your Eczema Triggers

If you live with eczema, you know how frustrating it can be when a flare-up appears out of nowhere. The itching, the redness, the disruption to your daily life — it can feel overwhelming. But here’s the good news: most flare-ups aren’t random. They’re triggered by something specific, and with the right approach, you can figure out what that something is.

What are eczema triggers?

Eczema triggers are substances or conditions that cause your skin to react. They vary widely from person to person, which is why what works for someone else might not work for you. Common categories include:

Foods — dairy, eggs, wheat, soy, and nuts are among the most frequently reported dietary triggers
Environmental factors — dust mites, pollen, pet dander, mould, and changes in humidity
Irritants — fragrances, certain fabrics (especially wool), harsh soaps, and detergents
Stress — emotional stress can weaken your skin barrier and trigger or worsen flare-ups
Temperature changes — sudden shifts between hot and cold, or excessive sweating

Why triggers are so hard to pin down

The challenge with eczema triggers is that reactions are often delayed. You might eat something on Monday and not see a flare-up until Wednesday. This delay makes it nearly impossible to rely on memory alone. Add in the fact that multiple triggers can overlap, and it’s easy to see why so many people struggle to identify their personal triggers.

How an elimination diet helps

An elimination diet is one of the most effective ways to identify food-related eczema triggers. The idea is simple:

Reset phase — you temporarily remove the most common trigger foods from your diet for a set period, giving your skin time to calm down
Reintroduction phase — you add foods back one at a time, carefully monitoring your skin for any changes
Identification — by isolating each food, you can clearly see which ones cause a reaction

It’s not about restricting your diet forever. It’s about gathering evidence so you can make informed choices about what you eat.

Tips for getting started

Keep a daily log — track what you eat, your environment, stress levels, and how your skin looks and feels each day
Be patient — it can take two to four weeks on the reset phase before you see significant improvement
Reintroduce one food at a time — wait at least three days between reintroductions so you can spot delayed reactions
Work with a professional — if possible, consult a dermatologist or dietitian who understands eczema and elimination diets

How Dermy can help

This is exactly what Dermy is being built for. The app will guide you through each phase of the elimination diet, help you log your daily triggers, and surface patterns you might miss on your own. Our goal is to make the process as straightforward and supportive as possible — so you can focus on feeling better, not on spreadsheets.

We’re still building Dermy, but if this resonates with you, join our waitlist to be the first to try it.