Hi,
I am wearing the Forerunner 935 almost constantly for 3 days now and notice red skin irritation on the place where I wear the watch.
It is plastic, maybe that is the reason. I had it too with my Forerunner 630...
I never had this with my V800, but that was metal.
Don't think there is a solution to the problem?
After I go for a run I clean the watch under the shower.