Interesting that you haven't used or eaten anything new. Sure hope it clears up. I believe our skin reacts to things we have been eating or using for a long time..just like our nose does! :)
I did get an insect byte Sunday morning..did not see the insect..just the sting on my wrist..tis a puzzle.
I drank milk all my life and suddenly became allergic when I was 18..no sensitivity now.