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My mom had the same thing happen to her but with a fitbit. It just looked like a red patch of blistered skin in the shape of the watch. I get the same way with certain jewelry if I wear it for a long time without a break. It could just be something like that and not the product itself but it's hard to tell.
Sound like a sweat rash that develops when you wear something on your wrist for extended periods of time. The resolution is to clean your device daily with alcohol 90% or higher. Also give your wrist a hour or more rest with the device off to allow the skin moisture on you wrist to balance out. I have a bluetooth version and it does the same as my Fitbit and other fitness wrist devices.
I thought it was just me, glad that I got on here to read that I may not be alone.
I also have the pain in the wrist, elbow, and fingers that I have read on other discussions.
Did you ever determine the cause of either of these?