Alternatively, you can get zinc-free hardware replacements.
Later on I suspect it was many hours playing in orchestras with a more relaxed posture that caused me to lose it. All this time I used a shoulder rest (which of course doesn't touch the neck) and a chin rest. But on the debit side, I can't help recalling the comment of one of the Delme Quartet during a coaching session, "you know you shift position all wrong?". Hey, ho.
At the time I purchased them they were being sold by a number of on-line dealers. There are two different brands of the same design. One of them was "M. E. Strings" that still seems to be available:
https://www.ebay.com/itm/322109345547?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&mkscid=101&itemid=322109345547&targetid=1262779893289&device=c&mktype=&googleloc=9032089&poi=&campaignid=14859008593&mkgroupid=130497710760&rlsatarget=pla-1262779893289&abcId=9300678&merchantid=111991726&gclid=Cj0KCQjwmN2iBhCrARIsAG_G2i5xNwk4EoylFSnyqRLNzVXAINfXWNk83C_yNfcGza76PSOF4kt7xmAaAgOVEALw_wcB
They are removable and washable washable, but I keep them on the instruments all the time and have never yet washed one.
I think they are made to fit a center-mount Guarneri chinrest, but I've been using them on left-mounted Stuber chinrests with no trouble. Previously I made my own covers with chamois that covvered the hardware and cushioned my collarbone and velcroed it to my chinrests.
My current chinrest -- which is very, very old -- seems to annoy my skin much more. I think it accumulates dirt and oils more than anything else I've ever used, and if I don't clean it regularly, it leads to bacterial infection.
I don't like the feeling of a chinrest cover, but a shirt collar will generally be adequate protection. My violin is pretty loosely held, but I also have a fat face, so there's that.
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Do all you can to assure you have a chinrest that BEST fits the shape of your chin/jaw.
If you play a lot you are probably going to have thicker skin there just as you will on your finger tips/pads. (As I sit here writing this I can feel the hickey under the left side of my jaw. I sort of remember how it felt when it first started to develop - during WW-II.
Keep the hickey clean, prevent/fight infection with alcohol or Zephiran Chloride antiseptic.
Use a soft cotton or chamois-leather pad on your chinrest and in contact with your collarbone. Keep it clean. - keep it "YOURS!"
I learned much of this at a coached chamber-music workshop week 46 years ago where we played 8 hours a day and then 4 hours a night "freelancing." Of course, by then my hickey was already approaching middle age, but that week really reactivated it.
If in doubt see a dermatologist for assessment.