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Metals & Allergies

Metals and skin: what actually causes a reaction

If a ring leaves a red, itchy band on your finger, the metal is often blamed first. Sometimes that is right. Often it is not. This page explains what a metal allergy really is, which metals are genuinely worth worrying about, and how the answer is usually decided by how much metal a piece releases onto skin rather than what it contains.

The one thing worth knowing first

A metal reaction is not the same kind of allergy as hay fever. Hay fever, bee stings and food allergies work through antibodies and happen within minutes. Jewelry reactions are allergic contact dermatitis, driven by a different part of the immune system: T cells. Those take their time.12

That single difference explains almost everything people find confusing. The rash usually appears one to three days after contact rather than straight away, which is why the timing rarely feels obvious.12 In someone already sensitised, a flare can begin sooner, sometimes within the first half hour, so a quick reaction does not rule metal out.3 It looks like eczema rather than hives. And it explains the question we hear most often in the store: why now, when I have worn this ring for years? Becoming allergic is something that builds with repeated exposure, and people "may have been in contact with the allergen for years before becoming sensitised."2 Nothing changed about the ring. Something changed about you.

Metals at a glance
MetalReaction riskWhat is actually going on
NickelMost commonThe most frequent cause of metal contact allergy worldwide, and jewelry is the leading source.
CobaltNotableSecond most common metal allergen. Usually appears alongside nickel allergy.
GoldComplicatedPositive tests are surprisingly common, but they often fail to explain the rash the person actually has.
PalladiumTied to nickelRarely a problem on its own. Almost everyone who reacts to palladium also reacts to nickel.
CopperWeakA weak sensitiser. Green marks on skin are not an allergic reaction.
SilverRareTrue silver allergy is genuinely rare. Blame usually belongs to the alloy or the plating beneath.
PlatinumVery rareMetallic platinum is close to inert. The scary studies are about refinery dust and chemotherapy drugs.
TitaniumRare, debatedReactions are uncommon and hard to prove, partly because there is no reliable test for it.
Stainless steelLow, with caveatsContains nickel but normally releases almost none. Grade and plating matter.
Tungsten carbideDepends on binderThe tungsten is inert. What matters is the metal binding it together.

The idea that explains most of this page

What a metal contains and what it puts onto your skin are two different things, and only the second one matters. Stainless steel is the clearest example. Surgical grade 316L is roughly 10 to 14 percent nickel by weight, yet in testing it released essentially none, under 0.025 micrograms per square centimetre per week, because a chromium oxide layer seals the surface.4

Europe wrote its law around exactly this. The limit for items in prolonged contact with skin is 0.5 micrograms per square centimetre per week, and for posts worn in pierced ears it is 0.2.45 Those are limits on release, not on content. A high-nickel steel can pass comfortably while a lightly plated piece fails.

Worth knowing: the United States has no comparable federal limit on nickel release in jewelry. The American Academy of Pediatrics has formally supported US legislation modelled on the European standards.6

Two things break the seal. The wrong grade: the high-sulfur free-machining grade AISI 303 released far more and did provoke reactions, where low-sulfur grades such as 316L provoked none.7 And plating: putting 316L through a standard electroplating cycle raised nickel release to twelve times the European limit, because plating removes the passive layer and leaves microporosity behind.4

Nickel

Most common metal allergen

Nickel is the one to know. It is the most frequent cause of metal contact allergy worldwide, and in the largest North American patch test series, jewelry was the most commonly identified source.89

How common

Figures depend heavily on who was tested, so treat any single number carefully. Across general population studies, nickel allergy runs at roughly 8 to 18 percent depending on country and period, with a pooled estimate of about 11 percent.1011 Among people sent to a clinic because they already have a rash, rates are higher: about 18 percent in recent North American data.9 The American Academy of Dermatology tells consumers that more than 18 percent of people in North America are allergic to nickel.12 That is a general population claim, and it sits at the very top of the range above rather than alongside the pooled 11 percent estimate. Women are affected more often than men in essentially every study.11

Why jewelry is such a good trigger

Skin contact that is close, warm and constant is the ideal setup. Prolonged contact combined with sweat and friction softens the outer skin layer and helps nickel move into it.3 A wedding band is the most demanding version of that: continuous contact, trapped moisture, for years.

Regulation works. After Europe restricted nickel release, allergy rates among younger women fell measurably, from about 20 percent to about 11 percent in one general population comparison.11

Gold

Common on tests, rarely the culprit

Gold is not as inert as its reputation suggests. Metallic gold in contact with skin is slowly ionised, which lets it be absorbed and act as an allergen.13 The American Contact Dermatitis Society even named it Contact Allergen of the Year in 2001.14

Here is the twist that matters. Positive gold patch tests are fairly common among people being tested for dermatitis, with a pooled figure around 14 percent across recent studies, though results vary enormously between studies.15 But a positive test frequently fails to explain the rash the person actually came in with. Gold reactions are also slow, often needing readings a week or more later, and they can linger for months.14

Does karat change the risk?

Not in the way people assume. Karat measures how much gold is present: 24k is essentially pure, while 18k, 14k and 10k are 75, 58.3 and 41.7 percent gold. US rules require that karat designation to appear with the word gold.16 It says nothing about which metals make up the rest. Yellow gold is typically alloyed with copper, silver and often zinc. Nickel belongs to the white gold conversation, not to yellow gold as a category.

So advice to choose 18k or higher is really advice to dilute the alloy, which reduces exposure to whatever else is in it.1217 For the rare person genuinely allergic to gold itself, going higher in karat does not help.

White gold, rose gold and rhodium plating

Depends entirely on the alloy

White gold comes in two families: nickel based and palladium based. That distinction matters far more than the karat stamp.

The classic study is still the clearest. White gold containing 2 to 15 percent nickel released measurable nickel into synthetic sweat over a week, and every one of the 18 nickel sensitive women tested reacted to the discs. Rhodium plating reduced the release but did not stop it.18

The detail worth carrying away: those same discs tested negative on the dimethylglyoxime spot test, the common home nickel test, and still caused reactions in every sensitised person.18 A clean spot test is not a clean bill of health. More on that below.

Rhodium plating

Plating is a barrier with a service life, not a change to the metal underneath. It wears and eventually needs redoing, after which the alloy is back against skin.17 European rules treat coatings the same way, requiring them to hold up for a minimum of two years of normal wear before release is measured.5 This is one reason a piece can be comfortable for a few years and then stop being comfortable.

Rose gold

Rose gold is gold with more copper in the mix. Copper is a weak sensitiser: pooled patch test data put positive reactions at about 3.8 percent, and those positives often turn out not to be clinically relevant and reproduce poorly on retesting.19 If someone reacts to a rose gold piece, nickel elsewhere in the alloy is the more likely explanation than the copper.

Sterling silver

True silver allergy is rare

"I am allergic to silver" is one of the most common things we hear, and it is usually not what is happening. Genuine silver contact allergy is rare. One review noted that despite silver being used very widely in wound care, contact dermatitis caused by it had been confirmed only once. Across all exposures the review describes only a handful of case reports, five of them occupational. The authors noted that more cases may simply have been missed, since silver is not commonly considered an allergen.20

What "sterling" guarantees is narrow. US rules require at least 92.5 percent pure silver for the sterling mark and say nothing about the remaining 7.5 percent.16 In practice that balance is copper, though traces of other metals can be present, and silver plated jewelry carries the extra question of what the base metal underneath is.17 The American Academy of Dermatology lists sterling silver among the metals it suggests for people avoiding nickel.12

Marks that are not allergies

Three different things get called a silver allergy and none of them are one. Tarnish is a reaction on the surface of the metal, not in your skin. Green marks come from copper, and they are chemistry rather than immunology. And black dermographism is a documented, harmless phenomenon where fine metal particles are abraded off jewelry by harder powders such as those in cosmetics and deposited on the skin, appearing black regardless of which metal it was. The paper describes two possible routes, physical abrasion by hard powders and a reaction with sulfur compounds in sweat, and notes it cleans off.21 It is a deposit on the skin rather than inflammation in it.

Why copper turns skin green

Sweat is slightly acidic, and it lifts a small amount of copper off the alloy. That copper reacts with chloride and bicarbonate in sweat to form green copper salts, which sit on the surface of the skin.45 Because copper is an alloying metal in sterling silver, brass and karat golds, a green mark is not limited to pieces made of solid copper.45 One of those salts, copper chloride, dissolves in water and comes off in the shower. Copper carbonate does not, and may need rubbing alcohol to shift.45 It is a surface reaction, not an allergic one, and a green finger on its own is not evidence of an allergy.

A simple test: a stain sits on the skin and can be washed or wiped away. A rash is in the skin, it itches, and cleaning does not touch it.

Platinum

Close to inert in jewelry

Platinum has a fearsome reputation online that does not survive contact with the actual literature. The confusion comes from lumping three unrelated things together.

  • Metallic platinum, the kind in a ring, is described in the occupational literature as relatively inert, becoming hazardous only when dissolved by strong acids into salt forms.22
  • Soluble halogenated platinum salts are potent sensitisers, but through inhaled dust in refineries, causing rhinitis and occupational asthma. That is a different immune pathway entirely, the antibody driven one.22
  • Platinum chemotherapy drugs given by infusion are a third, separate phenomenon.23

Only the first has anything to do with wearing jewelry. We will be straightforward about the limits of the evidence: because platinum is not part of standard patch test panels, there is no reliable figure for how common platinum jewelry allergy is. What can be said is that reports are scarce, and dermatology sources list platinum among the metals suggested for people avoiding nickel.1217 Platinum also needs no plating to stay white, which removes the wear-through problem that white gold has.

Palladium

Nickel free, but tied to nickel

Palladium is the main nickel-free whitener used in white gold, and for someone avoiding nickel it is a real improvement. It deserves one honest caveat.

Among patch tested dermatitis patients, palladium positivity runs at a median of about 7.8 percent, with wide variation between countries.24 But palladium allergy on its own is rare: mono-sensitisation, reacting to palladium without also reacting to nickel, has a median prevalence of about 0.2 percent.24 In practice, nearly everyone who tests positive to palladium also tests positive to nickel. The leading explanation is genuine cross-reactivity between two chemically similar metals, though that is not fully settled.24

What that means in a shop: palladium white gold is a sensible move away from nickel white gold, and for most people it solves the problem. It is not automatically a blank cheque for someone with an established nickel allergy, and whether a positive palladium test translates into trouble wearing a ring is exactly the part the research has not settled.24

Titanium

Rare, and genuinely debated

Titanium grows a tight oxide layer the moment it meets air, which is the basis of both its corrosion resistance and the chemical argument that it should not cause allergy.25

The honest position is that titanium reactions are uncommon but not mythical, and that the field cannot yet test for them properly. In the largest study, 1,500 consecutive dental implant patients were screened and 35 were selected for allergy testing. Nine of the 1,500, or 0.6 percent, tested positive, nearly all of them people who already had implant symptoms or an allergic history. Because only symptomatic patients were tested, that figure is a lower bound rather than a true prevalence.26 The major review concluded that clinical reports are rare and that current patch testing for titanium "is currently inadequate."25 A 2023 review put the confound plainly: across the studies it examined, no patient tested positive for titanium alone, and most were also positive for other metals such as nickel, chromium or cobalt.27

On the claim you may have read elsewhere that titanium contains traces of nickel: measured impurity levels vary by supplier and grade, and the highest value in one published sample set was 0.03 percent, in an aircraft-type alloy rather than commercially pure titanium.28 Whether that is enough to release meaningful nickel through an intact oxide layer has not been measured. Treat it as an open question, not an established risk.

One practical note: anodising titanium for colour grows a thicker oxide rather than adding a coating, and testing found no reduction in biocompatibility across anodising voltages.29

Cobalt chrome

Often sold as hypoallergenic. It is not.

Cobalt is the second most common metal contact allergen after nickel. In European general population testing, 2.1 percent reacted to cobalt, against 14.5 percent for nickel.30 Among North American patch test patients the figure was 7.3 percent, and jewelry was the most commonly identified source of both nickel and cobalt exposure.31

The alloy itself has been tested directly. Cobalt chrome molybdenum discs immersed in artificial sweat released substantial cobalt, and five of 52 metal-allergic patients reacted to them, while none of the 52 reacted to stainless steel discs. Every person who reacted was cobalt allergic.32

Cobalt and nickel allergy tend to occur together, generally through separate sensitisation to both metals rather than cross-reactivity.33 The practical consequence is that cobalt chrome is a poor default for the very people most likely to be shopping for an alternative metal, namely those who already know they react to nickel.

Tungsten carbide

Ask what holds it together

Tungsten carbide rings are a composite: hard tungsten carbide grains cemented together by a metallic binder. The carbide grains are largely inert. The binder is the part that can dissolve, and it is usually either cobalt or nickel.34

For cobalt binders the evidence is solid and comes from occupational dermatology. Discs made from cobalt-containing hard metal released cobalt into artificial sweat at levels high enough to provoke reactions in cobalt-sensitised patients.35 Work from NIOSH on cemented carbide powders went further, concluding that skin uptake may be sufficient not just to trigger existing allergy but to help cause it in the first place.36

Where we will not overstate: nickel-bound tungsten carbide is widely marketed as the hypoallergenic option. Nickel binders do show better corrosion resistance in metallurgical testing.34 But we could find no study measuring nickel release from these rings in sweat, and no testing of them on nickel-allergic skin. The claim is plausible and unproven. It also swaps in the most common contact allergen there is.

Worth being clear about the evidence base overall: it comes from people handling hard metal tools at work, not from ring wearers, and we found no published case reports of dermatitis from a tungsten carbide ring specifically. If you already know you react to cobalt or nickel, titanium, zirconium, tantalum and niobium are long-wearing alternatives without the open question, though none of them matches tungsten carbide for scratch resistance. They are far less brittle in exchange.

Is it even an allergy?

Several different things produce a red ring of skin under a wedding band, and only one of them is an allergy. Sorting them out is often the whole answer.

  • Allergic contact dermatitis. Immune driven, needs prior sensitisation, appears a day to three days after contact, itchy and eczema-like.2
  • Irritant contact dermatitis. Not immune at all, and it can affect anyone given enough exposure. Water, soaps and hand sanitisers are common causes, and burning or stinging is more typical than itch.37
  • Soap and moisture trapped under a ring. A band holds water and detergent residue against skin, which damages the barrier. The reaction is to what is trapped, not to the metal. Removing rings before washing and drying underneath afterwards is a reasonable thing to try.37
  • Marks and discoloration. Deposits on the skin rather than inflammation in it, including the harmless black dermographism described above.21 These wash off and do not itch.

Getting a real answer

Patch testing

Patch testing is the established way to identify a contact allergy, and it is not the same as the skin prick testing used for hay fever.38 Diluted allergens are taped to the back, removed after 48 hours, and read again a few days later, so it usually means about three appointments.39 Nickel sulfate sits in the standard screening series.40

Two honest limits. A positive result does not automatically mean it is causing your rash: relevance is a clinical judgement, and in one large series just over half of nickel positives, 55.5 percent, were judged currently relevant, a share that rose over time.9 And a negative result does not close the case, since the trigger may simply not be on the panel.38 The American Contact Dermatitis Society keeps a directory of clinicians who provide patch testing.41

The nickel spot test, and its catch

A dimethylglyoxime test kit turns pink where free nickel is being released from an object. It tests the item, not you. When it was validated against the European reference method, it had 97.5 percent specificity but only 59.3 percent sensitivity.42

Read that asymmetry carefully. A pink result is highly trustworthy. A clear result is not reassurance: the test misses roughly four in ten nickel-releasing items. This is the same limitation seen in the white gold study above, where discs that tested clean still caused reactions in every sensitised person.1842

What helps

Avoiding the metal is the most effective approach, and there is no desensitisation shot or pill for contact allergy the way there is for some other allergies.43 Barrier coatings applied at home have been studied and offer partial protection at best, weakening the longer the item stays in contact.44 Worth knowing: that study judged success by a negative spot test, the same test that misses roughly four in ten nickel-releasing items, so real protection may be weaker than it looks. Where a metal is genuinely the problem, changing the metal is the durable fix.

A note on medical advice

This page is general education about skin and metals. It is not medical advice and it cannot tell you what is happening with your own skin. If a reaction keeps returning, blisters, spreads, or does not settle once you stop wearing the piece, please see a board-certified dermatologist or allergist. Patch testing is the established way to identify a contact allergy, and knowing for certain beats guessing.

References

Every source below was checked and links to the article itself. Where the research disagrees or the data does not exist, we have said so on the page rather than rounding it into a tidy answer.

  1. Marwa K, Goldin J, Kondamudi NP. Type IV Hypersensitivity Reaction. StatPearls. ncbi.nlm.nih.gov/books/NBK562228
  2. Oakley A, Post R, Fuller JS. Allergic contact dermatitis. DermNet, reviewed 2025. dermnetnz.org/topics/allergic-contact-dermatitis
  3. Zhu M, Vinturache A, Ding G. Nickel allergic contact dermatitis. CMAJ. 2022;194(33):E1136. PMC9435531
  4. Emanuele R, et al. Nickel release from 316L stainless steel following a Ni-free electroplating cycle. Heliyon. 2024;10(17):e37125. PMC11402685
  5. Jewellery safety: metal content. Business Companion, UK Trading Standards guidance. businesscompanion.info
  6. Silverberg NB, Pelletier JL, Jacob SE, Schneider LC. Nickel Allergic Contact Dermatitis: Identification, Treatment, and Prevention. Pediatrics. 2020;145(5):e20200628. PMID 32341178
  7. Haudrechy P, Foussereau J, Mantout B, Baroux B. Nickel release from nickel-plated metals and stainless steels. Contact Dermatitis. 1994;31(4):249-255. PMID 7842681
  8. Ahlström MG, et al. Nickel allergy and allergic contact dermatitis: a clinical review. Contact Dermatitis. 2019;81(4):227-241. PMID 31140194
  9. Warshaw EM, et al. Epidemiology of nickel sensitivity: North American Contact Dermatitis Group data 1994-2014. J Am Acad Dermatol. 2019;80(3):701-713. PMID 30342160
  10. Alinaghi F, et al. Prevalence of contact allergy in the general population: a systematic review and meta-analysis. Contact Dermatitis. 2019;80(2):77-85. PMID 30370565
  11. Ahlström MG, et al. Prevalence of nickel allergy in Europe following the EU Nickel Directive: a review. Contact Dermatitis. 2017;77(4):193-200. PMID 28730624
  12. American Academy of Dermatology. Nickel allergy: how to avoid exposure and reduce symptoms. aad.org
  13. Möller H. Contact allergy to gold as a model for clinical-experimental research. Contact Dermatitis. 2010;62(4):193-200. PMID 20433442
  14. Chen JK, Lampel HP. Gold contact allergy: clues and controversies. Dermatitis. 2015;26(2):69-77. PMID 25757078
  15. Jensen MB, et al. Prevalence of contact allergy to gold in dermatitis patients 2010-2024: a systematic review and meta-analysis. Contact Dermatitis. 2024. PMID 39340195
  16. Guides for the Jewelry, Precious Metals, and Pewter Industries, 16 CFR Part 23. Federal Trade Commission. govinfo.gov, 16 CFR 23
  17. Ngan V. Jewellery allergy. DermNet. dermnetnz.org/topics/jewellery-allergy
  18. Fischer T, Fregert S, Gruvberger B, Rystedt I. Contact sensitivity to nickel in white gold. Contact Dermatitis. 1984;10(1):23-24. PMID 6705515
  19. Fage SW, Faurschou A, Thyssen JP. Copper hypersensitivity. Contact Dermatitis. 2014;71(4):191-200. PMID 25098945
  20. Lea A. Contact dermatitis with a highlight on silver: a review. WOUNDS. 2010;22(12):311-315. PMID 25901581
  21. Zawar V, Kumavat S, Pawar M. Black dermographism: an uncommon cause of skin discoloration. Indian Dermatol Online J. 2018;9(3):216-217. PMC5956881
  22. Heederik D, van Rooy F. Update on occupational allergy, including asthma, to soluble platinum salts. Curr Opin Allergy Clin Immunol. 2024;24(2):69-72. PMC10906205
  23. Sadrolvaezin A, et al. Systemic allergic contact dermatitis to palladium, platinum, and titanium. MedComm. 2023;4(6):e386. PMC10590457
  24. Faurschou A, Menné T, Johansen JD, Thyssen JP. Metal allergen of the 21st century: a review on exposure, epidemiology and clinical manifestations of palladium allergy. Contact Dermatitis. 2011;64(4):185-195. PMID 21392026
  25. Fage SW, Muris J, Jakobsen SS, Thyssen JP. Titanium: a review on exposure, release, penetration, allergy, epidemiology, and clinical reactivity. Contact Dermatitis. 2016;74(6):323-345. PMID 27027398
  26. Sicilia A, et al. Titanium allergy in dental implant patients: a clinical study on 1500 consecutive patients. Clin Oral Implants Res. 2008;19(8):823-835. PMID 18705814
  27. Watanabe M, Liu L, Ichikawa T. Are allergy-induced implant failures actually hypersensitivity reactions to titanium? Dent J. 2023;11(11):263. PMC10670842
  28. Harloff T, et al. Titanium allergy or not? "Impurity" of titanium implant materials. Health. 2010;2(4):306-310. scirp.org
  29. Hlinka J, et al. Electrochemical, biological and technological properties of anodized titanium. Materials. 2023;16(2):632. PMC9866561
  30. Schuttelaar MLA, et al. Prevalence of contact allergy to metals in the European general population. Contact Dermatitis. 2018;79(1):1-9. PMC6001707
  31. Silverberg JI, et al. Patch testing with nickel, cobalt, and chromium in patients with suspected allergic contact dermatitis. Dermatitis. 2024;35(2):152-159. PMID 38052041
  32. Summer B, et al. Patch test reactivity to a cobalt-chromium-molybdenum alloy and stainless steel in metal-allergic patients. Contact Dermatitis. 2007;57(1):35-39. PMID 17577355
  33. DermNet. Cobalt contact allergy. dermnetnz.org/topics/allergy-to-cobalt
  34. Balbino NAN, et al. Comparative study of corrosion behaviors of WC-NiMo and WC-Co cemented carbides. Materials. 2023;16(12):4480. PMC10304796
  35. Julander A, Hindsén M, Skare L, Lidén C. Cobalt-containing alloys and their ability to release cobalt and cause dermatitis. Contact Dermatitis. 2009;60(3):165-170. PMID 19260915
  36. Stefaniak AB, Harvey CJ, Virji MA, Day GA. Dissolution of cemented carbide powders in artificial sweat: implications for cobalt sensitization and contact dermatitis. J Environ Monit. 2010;12(10):1815-1822. PMID 20730217
  37. Ngan V, Patel K, Nixon R. Irritant contact dermatitis. DermNet. dermnetnz.org/topics/irritant-contact-dermatitis
  38. Coulson I. Patch tests. DermNet. dermnetnz.org/topics/patch-tests
  39. American Academy of Dermatology. Patch testing can find what is causing your rash. aad.org
  40. American Contact Dermatitis Society. ACDS Core Allergen Series. contactderm.org (PDF)
  41. American Contact Dermatitis Society. Patient resources, including a directory of patch test providers. contactderm.org
  42. Thyssen JP, et al. Sensitivity and specificity of the nickel spot (dimethylglyoxime) test. Contact Dermatitis. 2010;62(5):279-288. PMID 20536475
  43. Oakley A. Nickel allergy. DermNet. dermnetnz.org/topics/nickel-allergy
  44. Sprigle AM, Marks JG Jr, Anderson BE. Prevention of nickel release with barrier coatings. Dermatitis. 2008;19(1):28-31. PMID 18346393
  45. Balasubramanian P, Lakshmi C. A baffling presentation of a greenish macule on the chest. Indian J Dermatol. 2015;60(4):415-416. PMC4533550