Hi there, I have understood your concern and I will suggest you the best possible treatment options.
First of all do not panic.
The where spot that you have noticed can be due to physical reasons like friction, rubbing or
masturbation or rough sex activity. Or it can be due to swelling of the para urethral glands.
If it is not causing you any trouble at present,then just keep watch on it, look whether it is increasing or decreasing in size.
In case of any doubt please seek support from your treating doctor, get it examined.
You might need a 5 days course of broad spectrum antibiotic like Doxycycline.
I will suggest you to maintain vaginal hygiene. Use of Lactic acid containing vaginal wash during bath time is advisable.
I hope this answer helps you.
Thanks.
Dr. Purushottam Neurgaonkar.