Its not a chancre or herpes because of the duration of the sore.
A chancre wouldn't last longer than 4 weeks or so, and herpes would clear up within a few weeks, tops.
AJ
Thank you for the reply. Although your response does quell some of my concerns, I'm still a little worried. Why, exactly, do you think it's probably not a chancre? Is it because of my description of the sore, or of the length of time. I realize that I'm probably just being a hypochondriac, but any response would be helpful. Thank you.
No, its probably not a chancre (syphilis sore), and its not herpes, either.
You should get this checked though.
AJ