Please change the mouth wash, there were some mouthwashes which gave me white stuff on the tongue too and staining. Not all the mouth washes as effective, try more than one I don't know what place you are from.
And also I strongly belive it as candidal over growth in the entire system, so avoid all chocolates stuff for a while.
I had a hell of fordyce spots, that was when lips were peeling , once the peeling subsided, the fordyce spots are getting buried deeper into the newly growing healthy skin.