I had that issue for a short time. It was caused by irritation because I have to wear pads all the time, I didn't even think of it being a yeast infection because it was just the outer lips that itched and nothing else but that's what it was. A few days of treatment with topical cream and I was a.OK. Although, I do agree with the above poster, you need to make an appointment with your OBGYN and discuss this, it could be something serious.
It comes and goes, and there is no discharge and it's not a yeast infection, already checked.
Have you been. Heckled for a yeast infection?? That's a long time to go without even mentioning it to your dr..