I had this same vulval irritation/rawness until I changed to a saddle with a cutout several years ago. I would recommend that if you haven't already tried it. There are plenty on the market now that are not too spendy. I love the Terry Butterfly but just got a Performance women's contour for my mountain bike for much less and like it a lot. Here's the link - it's half price right now!

http://www.performancebike.com/shop/...tegory_ID=5211

Good luck!
Emily