I have had an Apple Watch for years and every time a new one comes out I get it. Only recently I noticed a smell on my wrist which seemed off so I took my watch off to wash my arm and was met with a large red blister where the sensor of the watch sits. Why have Apple never released a warning about this being a problem?
Apple Watch Series 5, watchOS 9
Hello Archangel83, Apple has issued warnings for people with sensitive skin or allergic reactions to Apple Watch materials like Nickel and Acrylates. Was the Watch getting HOT while wearing it? If you are close to an Apple Store you may want to have the watch checked out.
Wearing your Apple Watch - Apple Support
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Hello Archangle83, I'm no Doctor, but from your picture you definitely had some kind of allergic reaction. If it doesn't look better soon I would have a Doctor look at it and see if a determination of what caused it can be determined.
Apple Watch skin burn
