I purchased an Apple Watch Series 6 about 1 year ago. About a month ago I started noticing that it gives burns on the wrist, either under the watch itself, or on the opposite side under the metallic piece. As a medical professional I can tell you for sure that these are not allergic reactions. These are definitely burns. They don't appear all the time. I wear my watch on a constant basis (night and day) because I have cardiac problems. I use the watch sensors multiple times a day to measure my EKG, blood O2, heartbeats. I also monitor my sleep patterns and so on. I believe Apple is long overdue to explain themselves how could they allow this, considering the price tag they put on this watch. And please, don't send me to the doctor. I trained for 9 years to be able to differentiate a burn versus a skin allergy.