Nickel in the Diet and Dyshidrotic Eczema

For some people with nickel allergy, nickel-rich foods can feed pompholyx (dyshidrotic) eczema flares. What systemic nickel allergy is, the foods involved, and how to test it safely.

The connection between nickel, food and the skin

Nickel allergy is best known from jewellery, watch straps and belt buckles, the itchy rash where metal touches skin. In a subset of people who are nickel-allergic, eating nickel-rich foods can also provoke a skin reaction away from any metal contact, a phenomenon called systemic contact dermatitis. The flare most often linked to dietary nickel is pompholyx, also called dyshidrotic eczema: intensely itchy little blisters on the sides of the fingers, palms and sometimes the soles.

Who this affects

This is a minority within a minority. You need to be genuinely nickel-allergic (usually confirmed by patch testing) and to be one of the people whose skin also responds to dietary nickel. Many nickel-allergic people can eat normally with no skin effect at all, so dietary nickel is worth considering only when contact triggers have been ruled out and hand eczema or pompholyx keeps flaring without explanation.

Higher-nickel foods

Nickel is naturally higher in legumes (beans, lentils, peas, soya), oats and wholegrains, nuts, cocoa and chocolate, and some canned foods (it can leach from the can). Tinned and processed foods, and food cooked in cheap stainless steel, can add to the load. Lower-nickel choices tend to include many fresh meats, certain refined grains and most dairy.

How to test it safely

A low-nickel diet is restrictive and easy to get wrong nutritionally, especially since it cuts healthy foods like legumes and wholegrains. Do it only with a confirmed nickel allergy and ideally a dietitian’s guidance: a short low-nickel trial, watching the hands, then careful reintroduction to confirm the link and find your tolerance. A food-and-skin diary helps. Filtering tap water and not cooking acidic foods in old stainless steel are small practical steps.

When to get help

See a dermatologist if you have persistent pompholyx or hand eczema; patch testing can confirm nickel allergy and is the sensible first step before any dietary change.

Check it against your own list

A free database like Open Food Facts lets you look up a product’s ingredients, and Fig is genuinely good for managing a defined eating pattern such as a low-nickel trial. These give broad information rather than a check against your own skin. To check a product against the specific things that make your skin react, a personal-list app like ClearaScan lets you save your triggers once and scan any product, food, medication or cosmetic, against your ingredient guard list, flagging only yours. Its Reaction Journal lets you tie a flare back to the product that caused it, a shared Care Circle lets family scan for you, and a Trusted Products list keeps what you have cleared. It is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)

Written and reviewed by the Sensitive Skin Lab editorial team.