If this is a yeast infection, there are over the counter medications such as Monistat (found at any grocery story, pharmacy, etc.) which is pretty much medicated
pods that you insert into your vagina each day for a few days until it goes away.
Until this 100% clears up, do not have sex because one, although rare, you can give your partner a rash on his penis, and two, it is very uncomfortable for you!
Lastly, please please please use protection when having sex.