Here is a picture of "hairy tongue"...
http://stanfordmedicine25.stanford.e...25/tongue.html
More on this:
http://en.wikipedia.org/wiki/Hairy_leukoplakia
May respond to antiviral medications. (you did mention oral herpes, earlier).
I would stop eating or sucking on any candy for a while and see if that improves it. Including the Mountain Dew...which is an awful thing to consume anyway...IMO.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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