Devil's itch and burn

Kate
I've never really had trouble down there but recently I either cut myself or a rash opened up and it's been he'll. Right as it goes to heal I GENTLY rub it because it burns n itches. Then it all starts again. I've been using vagasil and it's done ok but today I bought a yeast Infection kit and then put some cream on after. Now as I go to put some vagasil on it burns like hell it feels on fire and I scream. I wiped it off n it has since mellowed out but I have work tomorrow and it hurts like he'll. What do I do!! I HAVE NOT HAD SEX. So it is not herpes or any sti's. I am super clean too. Please help!!