My girlfriend doesn’t have Reddit so I am posting this on her behalf… the other day I saw her watch blinking while she was napping. Like a flashlight almost. I didn’t think anything of it (possibly related?) but today she said her watch has been leaving a burn on her arm.. maybe this is due to some sort of sensor issue? Maybe it’s malfunctioning and scanning her skin more than it should? Idk how they work.. In any case this seems like a huge issue and we will be going to the Apple Store ASAP to address it..
Unless she has the watch on the side of her wrist that’s from underside of the pin buckle of a Sport Band, dollars to donuts. It’s either a fungal infection (think athlete’s foot) or an environmental contaminant transferred from the watch band.
Either way, topical creams should help. If it’s particularly stubborn, then go see a doctor. Clean the band throughly with antibacterial soap and water. She should to this after every shift, if she works in healthcare. Also occasionally remove the watch when washing hands to make sure you’re getting clean under the band itself.