Why is that laughable? This used to happen to me quite often. Started about a year after I'd gotten my first AW. I'd notice irritation under the AW, right where the sensor sits on my wrist. Sometimes, the skin would even be broken. I'd switch to the other wrist, until my regular wrist healed. Never had an issue with the other wrist.
It was a confusing problem and I thought it was due to prolonged exposure on my regular wrist.
Someone on MR mentioned soap, and I too thought that was a dumb idea. But then I started to think deeper. Every time I had this problem, I recalled that I had washed my hands maybe an hour or two prior. I also recalled that I wasn't particularly careful with splashing. Did a quick test by letting some suds splash onto my AW band and the results were SHOCKING! I got a rash within 30 minutes or so.
Now, when I wash my hands, I'm very careful to not splash soap too high up my wrists. If I do, I rinse my watch and my wrist. As long as I'm careful, I have zero issues.
Indeed, all kinds of people have all kinds of nasty reactions to all sorts of household products. It’s why “hypoallergenic” is such a thing. And it’s not at all hard to imagine somebody who’s fine with brief contact with a certain product but who has a bad reaction with the same product when the contact is prolonged.
Perfect example: splash a bit of bleach on your hands, wash it right off, and (with rare exception) you’re just fine. But put just one drop of bleach on a bit of clothing and wear it the whole day and you’ll get a rash — especially if the cloth is skin-tight.
There’s a really good chance that you’re only sensitive to certain ingredients in the soap, so changing to a different kind of soap might be a good idea regardless.
And the objection that these happen “suddenly” … you’re certainly suddenly aware of them, but that doesn’t mean that they’re happening suddenly. Everybody who’s only discovered a mosquito bite that “suddenly” started itching hours after coming indoors should be able to relate. Heck, just last week, I “suddenly” noticed a rash on the inside of my arm … that I eventually figured out was from my backpack strap. But it’s a sure bet that it didn’t actually happen “suddenly” the moment I noticed it. And, incidentally, the presentation of the rash was not unlike that of a burn — as anybody who’s ever experienced “rope burn” or “road rash” should be able to attest to.
A watch that actually gets hot enough for the heat to burn is one whose battery is experiencing thermal runaway. The watch will be unambiguously permanently damaged, in a very obvious manner. As in, swollen, split case, scorch marks, absolutely zero chance of it turning on or charging.
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