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If you have metal allergies, you might know that touching coins, jewelry and even doorknobs can trigger a reaction, known as allergic dermatitis. But it might surprise you to find out that metals may hide in other items you come in contact with every day. Which metals are most likely to trigger allergies, and where else do they lurk?

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Dermatologist John Anthony, MD, answers this burning question and shares his best advice for keeping metal allergies at bay.

It helps to understand what happens when your body comes in contact with a metal to which you’re allergic. “Metal allergies are similar to any other type of allergic reaction,” says Dr. Anthony.

Your skin cells pick up small molecules of metal, which travel to your lymph nodes. Your body treats the offending substance like a foreign invader and quickly mounts an immune response. The result: redness, itching, swelling or a rash, with skin blistering or scaling at the site.

The symptoms of a metal allergy range from mild to severe. Each time you’re re-exposed to the offending metal, your skin reacts in the same way.

“You can develop an allergy to any metal,” Dr. Anthony says. But nickel, cobalt and chromates are the usual suspects. Manufacturers often use nickel and cobalt to alloy with other metals. You’ll find these metals in lower-quality jewelry such as costume jewelry, he says.

If you’re allergic to nickel, cobalt or chromates, Dr. Anthony suggests swapping costume jewelry for jewelry made from higher-quality metals. Metals less likely to cause a reaction include:

If gold is your thing, be sure to choose yellow gold that is 14-karat gold or higher, he says. Avoid white gold and plated jewelry, as these are sometimes alloyed with nickel or cobalt.

You’ll need to look beyond jewelry for potential sources of metal. Metal can hide out in products and devices where you’d least expect it. Here are six surprising sources:

Skin-patch testing can help you find out if you are allergic to metal. If you are, it’s important to work with your dermatologist to find ways to limit your exposure.

“Whether it’s wearing gloves, adjusting your diet or painting the back of the button on the inside of your pants with clear nail polish, you have many ways to reduce or eliminate your exposure to metal allergens,” Dr. Anthony says.

Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

If you’re allergic to metal, you know that coins and jewelry may cause a reaction. But metals also are hiding out in places you might least expect. Find out where and how to manage your metal allergy.