1) Yes.
2) Usually but not always.
3) No. Herpes lesions cannot come and go in a matter of hours or a day, regardless of genital massage, trauma, masturbation, etc. Herpes lesions cannot ever recur more often than once every 4-6 weeks and are not related to external stimulation. There are no exceptions to this.
That's all for this thread.
Sorry, I thought you had an HIV test a few years ago. Since you're worried, have one now. You can expect it to be negative.
Report back if and when you have been tested, or if you have seen a health care provider about the blemish (but not until then). It does not suggest HIV.