I actually did show it to a dermatologist and he agreed that it was a thermal burn. My burn is minor because I took the watch off once I noticed the heat - others I‘ve seen on this feed look pretty bad. That is a major issue for apple. It‘s also very clear that it came from the sensor, when you look at my burn. Dermatitis does not usually have such a clear cut boundary to the inflammation.

I don‘t think it‘s very helpful that you keep commenting on almost every post for people to go and see a doctor. It‘s unusual to go to the doctor because of a first to second degree burn and people are commenting on this feed to tell and show other people that they had the same experience and thereby we can show that this is not a one off case and Apple should do something about it. I don‘t want to stop wearing my watch but I also don‘t want to risk getting burned again. Best case is they look into it and find a solution for it. Dismissive comments don‘t help.
Btw, I work for a dermatologist, I see skin burns and dermatitis every single day. I know whar a burn wound looks like.