Itchiness and dryness!πŸ˜–πŸ˜–

So for the past two days I've been really itchy and dry down there. I last had sex September 18. It was a one night stand and I don't know the guy's sexual history and I don't know if we used a condom ( I know, stupid). But anyways what could itchiness and dryness be a sign of?