Clearly you had a pimple or sebaceous cysts. Herpes does not cause deeper skin lesions of the sort you can pop like a pimple, and neither does any other STD. The 'white circle' is meaningless. No STD causes rash in the fold of the groin; that almost certainly is just irritation or a superficial bacterial or fungal infection (especially if you are overweight, i.e. not much air getting to your groin).
Intermittent testicular pain like you describe below isn't a symptom of any STD, especially if you don't have obvious large swelling of the testicle and tenderness to the touch.
If in doubt, return to your health care provider. I'm sure he will agree you have nothing to worry about, now that your nongonococccal urethritis (NGU) has been treated.
Good luck-- HHH, MD