Burning is a symptom of herpes only because herpes causes sores that are acutely painful, tender, and, well, burning
. A burning sensation
in the skin
, without blisters or sores, does not suggest herpes. I'm not sure what's going on here, but sensations like this -- unexplained burning, tingling, itching (without rash), or similar sensations of the genitals -- are among the most common symptoms that people ask about on this forum. All I can say is that no STD causes such symptoms.