Is it a yeast infection or bacterial?  I am currently battling a bacterial infection, but I am sure I got it because of loose bowels.  I think people have had yeast infections crop up during treatment due to the body cleansing itself.

Is it external?

Matia had told me to use jojoba oil.  I'm not sure how much it helps at times.  I saw that Desert Harvest makes a personal gel that is supposed to be good for soreness in that area.  It is aloe and it says you can cool it in the fridge.  It was about $12 if I remember right.  I was thinking of sending for it.  Maybe you could try that?