I'm prone to vaginal irritation at certain times of my cycle (like a week before my period), and during pregnancy. I think it's due to both a subtle change in the chemistry of my discharge and a subtle increase in yeast (but not really enough to be a real yeast infection, certainly without the traditional internal symptoms).
Point is, I found a PHENOMENAL solution to this after being uncomfortable for the first 2 months or so of pregnancy:
Burts Bees chapstick... not just for the lips on your face!
I have been SOOOOOOO much more comfortable since discovering it. I basically rinse clean and dry off thoroughly in the morning and the evening, and after each time I just put it on directly around the folds in my labia and I have had next to no irritation since a day or two after starting this.
The one warning is that it is a bit tingly or stingy or whatever, so if you try it, apply with caution (like to a very small area) especially the first time. Personally when I started using it the tingle was a relief from the irritation I had been experiencing and I guess it still is but I'm totally used to it.
I told my midwives and they hadn't heard of that approach before, but were pleased I had found something natural that worked for me. I do recall a natural minded OB/GYN mentioning vaseline for external yeast irritation to me several years ago and I think I may have tried it, but it was too heavy or something and was irritating in its own way - kind of keeping my tissues too soft so they got delicate. Burts bees has been like the best discovery I've had all pregnancy! I now buy it in bulk.