1year ago, i have a stdtest, was negative, lately i have 1only sexpartner, she isclean, but 7mnths later isee a rashon innerthight, its clear, but itch

Yeast infection: The description of your rash sounds like a fungus. It does not in any way describe any common std.

On you or her?: Inner thigh rash where they rub is most likely something we call in medical jargon as tinia cruex other wise know as jock itch. It is a type of fungal infection (not std) that takes advantage of moist irritated skin. Start with otc anti-fungal cream. If that doesn't clear it up then off to the doctor with you.