An over-the-counter antifungal medication can clear up a skin yeast rash. If you do not have success with this, speak with your physician about a prescription antifungal.
Apply a plain yogurt compress on the skin by smearing the yogurt on one side of a cloth and placing it on the rash for about half an hour to sooth and cool the rash. Put a few drops of tea tree oil in your moisturizer every day.
Over the counter Hydrocortisone cream should help the rash. A yeast rash will respond fairly quickly to hydocotisone and the ability to keep the area dry. Warm moist skin is a breeding ground for yeast infections.
The best treatment for a skin yeast rash is a good anti-fungal cream! (Even athletes foot cream! ). This can be purchased over the counter. Also eat yogurt! Don't scratch it!