Weeping Willow

Since STD's are easily diagnosed through testing you need to find out what tests were done, what the results were, etc... Don't be afraid to ask questions and ask for certain tests to be ran. If it doesn't go away or if it gets bigger in a few days go to another doc/health dept. and have them give you the STD work-up.
It could be something like a clogged skin cell, a pimple, or even a tiny blister caused by friction.
Things can "look" like anything. So far, after seeing 2 different docs you have 2 different "opinions"......<---that being the KEY word. My friends mom has been married over 30years. Went for her annual gyn check-up and the doc told her that her vagina "appeared" to be broke out from Herpes. That almost destroyed her marriage. After seeing 2 other docs in less than 2weeks they discovered she had a heat rash and an allergy on top of that. The point is.......things aren't always what they seem to be.
Another thing......If being diagnosed with Chlamydia taught me anything it taught me.......to ALWAYS use protection. If you find a "steady girlfriend" and wish to have unprotected sex, sit her down and explain to her that you both have had a past sexually and you feel the mature thing to do is go to a health department/doctor together and have STD testing before doing away with the condoms. If she's worth keeping and sleeping with she'll adore you for protecting her and yourself.