Metal Allergy (Nickel Allergy): Symptoms, Causes and Treatment
Metal allergy, most commonly nickel allergy, is one of the causes of chronic itchy rashes that many people in Thailand have without realizing it. Many assume that “itching after wearing earrings” or being “allergic to gold” is a minor matter, but it is actually an allergic skin reaction called allergic contact dermatitis. Once the body has “remembered” a metal, the allergy usually lasts for life.
In this article, a dermatologist explains what causes metal allergy rashes, which metals most often cause allergy, how to tell them apart from other rashes that look similar, the signs that mean you should see a doctor, diagnosis with a patch test, and treatment and prevention based on current evidence.
What causes a metal allergy rash? The real mechanism
A metal allergy rash is a Type IV delayed hypersensitivity reaction that depends on white blood cells called T-cells. It is not an immediate allergy like food allergy or hives. The mechanism has two stages:
Sensitization stage: When the skin is repeatedly exposed to metal ions such as nickel, the immune system gradually “remembers” the metal as a foreign substance. There are no symptoms at this stage, and it can take months to years.
Elicitation stage: When the same metal touches the skin again, the immune system that remembers it responds, causing inflammation and an itchy rash within 12–72 hours of contact, not the moment you touch it.
A key point people often misunderstand is that the rash usually appears 1–3 days after contact, so many people do not think of jewelry or an item they have just started using as the cause. Once the body has become sensitized, the allergy usually lasts a long time or for life, which is why avoidance is the core of care.
Which metals commonly cause allergy and where they are found
Many metals can cause allergic contact dermatitis. In order of how often they are seen:
Nickel: The number one cause of metal allergy worldwide. It is more common in women because of its link with ear piercing, and it is a component of many alloys.
Cobalt: Often an allergy that occurs together with nickel because the two are found in the same materials. Found in jewelry, cement and dyes.
Chromium: Especially hexavalent chromium, found in leather tanning, cement and leather goods.
Gold and palladium: Allergy is possible but less common.
Everyday sources of contact that are often overlooked:
Jewelry: Earrings (especially after a new ear piercing), necklaces, rings and bracelets. This is the most common source.
Clothing: Metal jeans buttons, belt buckles, bra hooks and zippers.
Watches and glasses: Metal watch straps, watch cases, eyeglass frames and nose pads.
Electronic devices: Mobile phones, laptops and some tablets with metal bodies.
Household and work items: Keys, coins, scissors, brooches and tools.
Medical: Braces, dental devices and, in some people, joint replacements or metal bone plates.
Symptoms of a metal allergy rash
Symptoms usually occur only where the skin touches the metal directly, and they have distinctive features that help with diagnosis:
Early symptoms: Itching, red rash, mild swelling and sometimes small clear blisters at the point of contact.
The shape of the rash points to the cause: The rash often matches the shape of the object touching the skin, such as a ring-shaped rash on the finger that wears a ring, a streak under a watch strap, or a circle under a jeans button near the navel. This clue helps identify the culprit clearly.
Chronic stage: With long-term repeated contact, the skin becomes thick, dry, scaly, cracked and darker (lichenification).
Severe symptoms: There may be oozing, open sores or repeated bacterial infection.
Rash spreading beyond the contact site (Systemic contact dermatitis): In some highly allergic people, itchy blisters may appear on the palms or between the fingers (dyshidrotic eczema), or a rash may spread over the body, even when the contact site is only a small spot.
How to tell a metal allergy rash from similar conditions
“An itchy rash where jewelry is worn” does not always mean metal allergy. Several conditions look similar but are treated differently. A doctor will distinguish them as follows:
Irritant contact dermatitis: Caused by friction, sweat, moisture or leftover soap under jewelry. It is not an allergy. It tends to sting more than itch and improves when friction or moisture is reduced.
Infection after ear piercing: A new earring that is painful, red, swollen or has pus is usually a bacterial infection, not a metal allergy. The wound needs care and may need antibiotics.
Atopic dermatitis: A chronic itchy rash in the skin folds in people with a history of allergy. It is not limited to where metal touches the skin.
Lumps from piercing (granuloma/keloid): A hard bump or raised scar at the piercing hole. It is not an allergic rash.
Fungal infection or other rashes: Tinea versicolor, ringworm or other rashes that happen to be in a nearby location.
A simple rule: if the rash appears where metal touches the skin, matches the shape of the object, mainly itches, and improves when you stop wearing it, it is usually a metal allergy rash. If it is unclear or keeps coming back, a patch test can give a definite answer.
Warning signs: when to see a dermatologist
Most metal allergy rashes are not dangerous, but you should see a doctor if you have any of the following:
A rash that is very red and swollen, with pus, pain or fever (suspected infection)
A rash that is spread over the body, or itchy blisters on the hands even though the contact site is only a small spot
A rash on the eyelids or face with no known cause (nickel from the hands or a mobile phone is a common cause)
A chronic rash that does not improve within 2–4 weeks even after avoiding metal and using medication
Rash, pain or swelling near a joint replacement, bone plate or implanted material
Planning metal surgery, dental work or braces when you have a history of metal allergy. Tell your doctor in advance.
Diagnosis with a patch test
A patch test is the gold standard for confirming which metal or substance you are allergic to. It is done as follows:
The doctor applies test patches containing samples of metals and several standard allergens to your back
They stay on for 48 hours, and you must keep them away from water and heavy sweating
The doctor reads the result the first time when the patches are removed (day 2) and reads it again on day 3–4 (or 7), because some metal allergy reactions appear late
Sites that react show a red, raised rash or small blisters, which shows which substance you are allergic to
There is also a nickel test for objects (Dimethylglyoxime / DMG spot test). A reagent is dropped onto jewelry or an item, and if it turns pink-red, the object releases nickel. This helps people with allergy choose safer items.
Evidence-based treatment of metal allergy rashes
The goals are to reduce inflammation in the short term and prevent repeated contact. The approach, in order:
Stop contact with the metal you are allergic to (avoidance) — the most important and most effective step. If contact does not stop, topical medicine only gives temporary relief.
Topical corticosteroid — the strength is chosen by body site: low strength (such as hydrocortisone) for the face and eyelids, and medium to high strength for the trunk, arms and legs. Use it for a short period as your doctor directs. Strong steroids should not be applied continuously to the face for a long time.
Calcineurin inhibitor such as tacrolimus/pimecrolimus — an option for rashes on the eyelids or face to avoid the side effects of steroids.
Oral antihistamine — helps reduce itching so you can sleep, but does not directly treat the cause of the inflammation.
Skin care and compresses — apply moisturizer to restore the skin barrier. If the rash is oozing, wet compresses may be used to reduce inflammation.
Severe or widespread cases — the doctor may give a short course of oral steroids, and antibiotics only if a secondary infection develops.
Prevention and choosing safer metals
Choose low-nickel-release materials: titanium, surgical-grade 316L stainless steel, genuine gold of 18K or higher, platinum or sterling silver. In particular, the first pair of earrings after ear piercing should be titanium or medical-grade stainless steel, because the open wound period is when sensitization is most likely.
Be careful with cheap items: Fashion jewelry and plated metal often contain high levels of nickel. The words “gold” or “hypoallergenic” on a label do not always guarantee that an item is nickel-free.
Create a barrier: Apply clear nail polish, or attach a sticker or plastic to the side of buttons and belt buckles that touches the skin (a temporary measure that must be repeated).
Reduce moisture: Sweat helps dissolve more metal ions. Drying off and removing jewelry during exercise helps reduce contact.
People with severe allergy and chronic hand rash (dyshidrotic): Some doctors may recommend a high-nickel diet restriction in certain selected cases. This should be done under a doctor's guidance, and you should not cut out foods on your own without need.
The relationship with cobalt and chromium
People who are allergic to nickel are often also allergic to cobalt, because the two metals are often found in the same materials. Co-reactivity is found in about 25–30%. As for chromium, pure Chromium III rarely causes allergy, but Chromium VI (hexavalent chromium), used in leather tanning, cement and industrial work, clearly can cause allergic contact dermatitis. This is why a standard series patch test should be done to check broadly which metals you are allergic to.
Common myths about metal allergy
“Gold allergy does not exist; you cannot be allergic to gold” — not always true. What people call “gold allergy” is mostly an allergy to nickel mixed into cheap or plated gold. Allergy to genuine gold does exist but is uncommon.
“All grades of stainless steel are safe” — some stainless steel grades still release nickel. The recommended grade for people with allergy is 316L (surgical grade).
“Expensive items cannot cause allergy” — price is not an indicator. What matters is the type of metal and the amount of nickel released.
“It will go away on its own, so there is no need to avoid it” — this allergy is permanent sensitization, and repeated contact makes it flare more. Avoidance is the key.
Frequently asked questions about metal allergy rashes
Can nickel allergy be cured completely?
Nickel allergy is a Type IV sensitization that usually lasts a long time or for life, so there is no way to make the allergy “go away.” However, it can be controlled very well by avoiding contact. When a rash appears, it can be calmed with topical steroids and skin care.
If I itch every time I wear earrings, is it because of nickel allergy?
It is quite possible, especially if the rash appears on the earlobe where it touches the earring post and improves when you take the earrings off. Try switching to titanium or 316L stainless steel earrings. If it still itches or there is pus, see a doctor to rule out infection.
How do I know which metal I am allergic to?
A patch test is the standard. Patches containing samples of metals and allergens are placed on the back for 48 hours, and the result is read again on day 3–4. This identifies what you are allergic to so you can avoid it precisely. Testing an object with DMG reagent shows whether that item releases nickel.
What jewelry should I choose if I am allergic to nickel?
Choose titanium, 316L stainless steel, genuine gold of 18K or higher, platinum or sterling silver, and avoid fashion jewelry or cheap plated metal, which often contains high levels of nickel. The first pair of earrings after ear piercing should always be nickel-free material.
If I am allergic to nickel, will I be allergic to other metals too?
People who are allergic to nickel are often also allergic to cobalt, in about 25–30%, because the two are often found in the same materials. If you are concerned, a standard series patch test should be done to check broadly.
I am allergic to my watch strap or jeans button. What can I do?
Switch to a strap made of leather, fabric, silicone or titanium. For metal buttons, attach a sticker or apply clear nail polish to the side that touches the skin as a temporary barrier, and keep the area dry and free of moisture.
If you have a chronic itchy rash where your skin touches jewelry or metal items, a patch test can help find the real cause and plan precise avoidance. Consult a dermatologist at Siam Dermatology, call +66 61 448 7000 or LINE @siamderm
Written by Dr. Patara Voravutinon, Dermatologist · Last reviewed August 22, 2026
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