I can't say what you have, follow up with your Dr for a full exam. Doe snot sound like a STD.
I also neglected to mention that the redness disappears depending on the day I do have an achy back. I read that backache is a symptom of HSV. My buttock also is itchy and gets irirtated. I also apply neosporin to my lip due to the irritation. Figure it can't hurt. I may be wrong though. I've never had an actual sore, swollen glands (don't usually get sick) or fatigue outside the norms of a day. though. So, it leaves me unsure.