Hi there
Unfortunately, without being able to see it, it will be difficult to tell you exactly what is going on. I CAN tell you that Herpes (genital) do not always come in the form of groups of large blisters (like you would typically think about with Herpes). Some people will often mistaken a small outbreak as an insect bite or other minor skin condition. You mentioned itchiness that turned into pain....this is very typical for Herpes. A few other options could be irritation from sexual intercourse, irritation from any soaps, creams, or detergent. Also, the absolute best way to know if it is genital herpes is to go ahead and take a treatment of Valtrex or Zovirax (as most people who know they have herpes will have this on hand in case of a sudden breakout) and see it this helps, or let your OB/GYN take a look.
Hope this helps!
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Nurse
17 years exp. in all areas of nursing including emergency medicine, hospital, and private practice.