Women with nonrecurrent, once in a blue moon vaginal yeast infections might want to try boric acid suppositories. You can make them yourself using 00 gelatin capsules (available at many health food stores and boric acid powder (available at most pharmacies. One of these every twenty four hours for a few days should make the vagina acidic enough to kill off the yeasties.
If you're not sure whether or not it's a yeast infection, you should probably see a doctor before attacking it.
I'm sure I read this in Our Bodies, Ourselves, but it must have been an older edition because I can't find it in the current one.
Tea tree oil applied with a cotton swab will clear up a yeast infection in your belly button.