Rash? Please help by answering this.?

I started my period last month and I got a really bad rash (It's red, and has bump like blisters on it on the outer part of my vagina), I'm assuming from the pads, but the rash hasn't gone away and it's almost been three weeks. Do you think it'd because I've been irritating it? I'm really scared, and I don't know what it is. Do you think it's curable? Maybe a yeast infection? Please answer. It seems to be getting better because it hasn't been itching like it was a couple days ago, should I go to the doctor right away? (I don't really want to) Or should I wait a couple days and see if it starts to go away? Again please answer.