What Is Nickel Allergy?

Nickel allergy is a type of allergic contact dermatitis caused by an immune reaction to nickel exposure.

Common sources of nickel include:

• jewelry
• watches
• jean buttons
• belt buckles
• eyeglass frames
• zippers
• cell phones

Nickel allergy can cause:

• itching
• redness
• scaling
• dry cracked skin
• blistering
• chronic hand dermatitis

Many patients first notice symptoms where metal contacts the skin, such as the ears, wrists, neck, or abdomen.

Can Nickel in Food Trigger Dermatitis?

For some patients, yes.

Nickel is found naturally in many foods, and in certain nickel-sensitive patients, dietary nickel may contribute to widespread eczema or recurrent hand dermatitis. This phenomenon is sometimes referred to as systemic nickel allergy syndrome (SNAS) or systemic contact dermatitis.

The relationship between dietary nickel and eczema is still somewhat controversial, and not every patient with nickel allergy benefits from dietary modification. However, there is clinical evidence suggesting that reducing dietary nickel may help selected patients.

A 1993 Study on Low Nickel Diets

One of the original studies on this topic was published in the Journal of the American Academy of Dermatology in 1993 by Veien and colleagues.

The researchers studied nickel-sensitive patients who:

• had positive nickel patch testing
• experienced recurrent dermatitis
• reacted to oral nickel challenge testing but not placebo

Many of these patients had chronic hand dermatitis or recurrent eczema flares.

After following a low nickel diet:

• 58 of 90 patients showed short-term improvement
• 40 of 55 patients who continued the diet reported long-term improvement 1–2 years later  

The study was not perfect by modern research standards, but it is an interesting paper that supports the idea that dietary nickel may worsen dermatitis in some patients.

Which Patients May Benefit Most From a Low Nickel Diet?

A low nickel diet is not necessary for every patient with nickel allergy.

However, we at Pure Dermatology may consider a trial of dietary nickel reduction in patients with:

• chronic hand eczema
• recurrent vesicular hand dermatitis
• widespread eczema
• persistent dermatitis despite allergen avoidance
• severe nickel allergy confirmed by patch testing

Patients with hand dermatitis seem to be one of the more commonly described groups in the medical literature.

Foods High in Nickel

Foods commonly considered high in nickel include:

• chocolate and cocoa
• nuts
• legumes
• soy products
• oatmeal
• bran and whole grains
• seeds
• canned foods

The 1993 study also discussed possible aggravation from certain foods and beverages such as red wine and some canned foods.

Completely eliminating nickel from the diet is essentially impossible, and we encourage instead focusing on reducing high-nickel foods during a trial period.

How Is Nickel Allergy Diagnosed?

Nickel allergy is typically diagnosed through patch testing.

Patch testing is different from food allergy testing. Small amounts of allergens are placed on the skin under adhesive patches to evaluate for delayed allergic reactions over several days.

Nickel is one of the most common positive allergens identified during patch testing.

Patch testing can also identify additional triggers contributing to eczema, since many patients with nickel allergy are allergic to more than one substance.

Nickel Allergy Is Often Only Part of the Picture

One important point is that many patients with chronic dermatitis have multiple contributing factors.

Even when nickel allergy is present, eczema may also be worsened by:

• fragrances
• preservatives
• soaps and detergents
• stress
• sweating
• irritants
• additional contact allergens

The 1993 study itself noted that sweating and psychologic stress were commonly reported flare factors among patients with nickel dermatitis.

This is one reason why a comprehensive dermatologic evaluation is important.

Should You Try a Low Nickel Diet?

A low nickel diet may be worth considering in carefully selected patients with:

• positive nickel patch testing
• chronic hand dermatitis
• recurrent eczema flares
• persistent dermatitis despite standard treatment

We recommend a practical and time-limited trial rather than an excessively restrictive long-term diet.

Because dietary restriction can be challenging, it is best approached with guidance from your dermatologist and tailored to your symptoms.

Patch Testing for Nickel Allergy in Austin, TX

At Pure Dermatology, we provide comprehensive evaluation and treatment for allergic contact dermatitis, chronic eczema, and nickel allergy.

Our dermatologists offer advanced patch testing to help identify potential allergens contributing to persistent rashes and hand dermatitis.

If you are struggling with chronic eczema or suspect a contact allergy, contact our Austin dermatology team to schedule an evaluation.

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