Ok I'm not a dr but some advice from experience it sounds yes it's a yeast infection. No big deal just unpleasant & uncomfortable pretty common. Any store such as target, Walmart, Kmart, cvs, rite aid, Walgreens stores of that nature will carry treatment. Monistat 1 or a generic kind will do it's a yeast infection treatment. Could be soap you use, underwear frabric, sprays, wipes setting off your ph balance. A variety of things but that should do the trick for you. It's common don't freak out, you will be back to normal soon.