I would also reccomend getting checked, but just to say, I had something like this, and I got checked, and i was negative. turned out it was simply where I'd gotton a rub from my panties, needless to say I chucked those ones away!
hope everything comes back clear
Hello.
Sounds like Herpes to me. There are also other possibilities. You need to go to your nearest women's clinic for testing ASAP.
In addition, you should inform yourself regarding risk reduction. If you are having unprotected penis-vagina sex, you are at risk for lots of infections and diseases, including Herpes, warts, etc. See the MedHelp site below for further information.
http://www.medhelp.org/medical-information/show/1723/Safe-sex-