I've never had a cold sore.
Have you had a cold sore recently? I had a cold sore and it caused me to have erythema multiforme, which is a red, itchy painful rash all over the body.
I've tried benadryl and it didn't work. My doctor prescribed me something different and it's not working. I've tried an oatmeal bath and itch cream. Nothing is helping.
I had that with my son and it was called PUPS the dr prescribed me some Benadryl and it helped