Why does my finger get a rash under my engagement ring?

Nine times out of ten, a rash under an engagement ring is contact dermatitis from moisture and soap trapped against the skin. Not a metal allergy. I'm not a dermatologist, but I see this at the bench often enough to walk you through the usual suspects in order.

First thing to check is how the ring fits and how often it stays wet. A band that's snug against the finger creates a seal. Hand soap, hand sanitizer, dish soap, lotion get under there and don't rinse away. The skin macerates. The rash is usually red, slightly shiny, maybe a little itchy, and it follows the exact footprint of the band. Solution is unglamorous: take the ring off when you wash your hands, dry your finger thoroughly, and put it back on when your skin is completely dry. If the rash clears in three or four days, it was never an allergy.

If that doesn't fix it, the next suspect is nickel.

The nickel problem in white gold

White gold is not a natural metal. It's yellow gold alloyed with whitening metals, and in the US the most common whitener is nickel. 14k white gold can contain enough nickel to trigger allergic contact dermatitis; 18k white gold usually contains less, but it still can. The catch is that most white gold rings are rhodium plated at the bench before they leave the shop, which puts a barrier between your skin and the alloy, and that barrier is not permanent. Rhodium is hypoallergenic. The plating wears off in six to eighteen months on the inside of the shank, especially if you wash your hands a lot or wear the ring to the gym. Then the nickel is right against your skin.

Last spring a client named Mara came in with a rash under a 14k white gold ring she'd worn every day for a year, through showers and hand sanitizer and dishwashing, and by the time she sat down, the rash had spread slightly beyond the edges of the band. It looked like textbook nickel allergy: red, itchy, tiny bumps, worse after a shower. She'd tried cortisone cream and it kept coming back. The rhodium was completely gone on the inside of the shank. We had two options: re-rhodium plate every six months for the rest of her life, or reset the stone into a palladium white gold setting. She chose the reset. The rash was gone in two weeks. Not a romantic fix, but it worked.

If you suspect nickel, ask a dermatologist for a patch test before you spend money on a new setting. Some reactions are actually to soap or lotion, and you don't want to reset a ring for a problem that was really your hand cream.

Other causes I see

• Fungal or yeast overgrowth. A warm, wet band environment can breed yeast, especially under wide bands that don't breathe. This usually needs a doctor's treatment, not a jeweler.
• Tight sizing. A ring that's a quarter size too small traps moisture and friction. Resizing often solves both the rash and the discomfort. A simple gold band can usually be sized up or down easily; rings with full pavé or tension settings can be much harder. I don't recommend buying a ring you can't get sized.
• Platinum is not always the answer. True platinum allergy is rare, but some platinum rings are alloyed with cobalt, and cobalt allergy exists. If you've reacted to a platinum ring, ask what alloy it is. 950Pt/Ru versus 950Pt/Co matters.
• Chlorine and pool chemicals. Not an allergy exactly, but trapped chlorine under a ring can irritate skin and also degrade white gold prongs over time. Take the ring off for swimming, no matter what metal it is.

What to try before you panic

1. Remove the ring and dry the finger completely after every hand wash. No lotion on that finger while it's healing.
2. Clean the ring at home: warm water, a drop of mild dish soap, a soft toothbrush. Rinse thoroughly. Buff dry. You'd be surprised how much soap scum and dead skin accumulates inside a setting.
3. If the rash clears and returns only when you wear the ring after it's been plated, it's probably nickel. Talk to a dermatologist about patch testing, then talk to a jeweler about resetting into palladium white gold, 18k yellow gold, or platinum.
4. If the rash is cracked, weeping, spreading up your finger, or doesn't clear after a week, that's a dermatology appointment, not a jewelry question. I'll fix the ring after you've got the skin sorted out.

One more thing. The worst thing you can do is keep wearing the ring through a reaction and hope it goes away. It won't. The skin gets angrier, the setting gets grimier, and by the time you act, you've got two problems instead of one. I'd rather see you take the ring off for a week and figure out the cause than have you miserable every time you put it on.

And no, it doesn't mean the ring is cursed. It means something is touching your skin that shouldn't be. Find that, and you get your ring back.