I wear 2 watches... That burn above the other bracelet is from my apple watch (series 5).
Apple support also gave me some spiel about it being some contaminant or badly cleaned watch (it was like 2 weeks old at the time so lord knows what they think I'm doing to get it so messy), or nickel allergy..
The other watch (The Omega) I rarely take off and I've never had a problem with it.
So I now suspect Apples' "reasons" are BS because I think they know or at least deeply suspect what causes it.
If I were to hazard a guess.. This is something related to the intense green light on the rear of the watch.. I suspect this because if I turn off the heart monitoring feature (Settings / Privacy / Health) this problem does not occur. I think some people under some specific circumstances are affected - they get what amounts to a burn from this light. Is the light staying on too long? , is it too bright?.. or is it just a sensitivity that some people get? - I don't know. But I think Apple should level with people and say - not tell them it's because it's an allergy / or contaminants. Some prominent warning on the packaging.. Because if people knew this could happen, or had a family history of illnesses caused by exposure to light .. the might think twice about buying this.
