Here are some antifungal herbs that can get the job done. I believe that garlic is among our best antiseptics in general and antifungals in particular, closely rivaling teatree oil. At the Banaras Hindu University in India, scientists working with garlic compounds showed that one of its chemical constituents, ajoene, was almost as effective against mildew fungus as several pharmaceutical antifungals. Several other studies have shown similar results. Clinical trials have also yielded impressive results.
Garlic extract is even more potent when applied externally.
I know from both research and personal experience that it boosts the antifungal effectiveness of pharmaceutical antifungal drugs. Simply liquefy raw garlic in a blender and use a cotton ball or clean cloth to apply it directly to the affected area three times a day. Acording to my database, licorice contains at least 25 fungicidal compounds, more than any other herb listed. Oddly, I haven't found any good clinical trials on using licorice extracts to treat fungal infections, but based on this herb's antifungal content, I'm confident that it would help. You can make a strong decoction by adding five to seven teaspoons of powdered licorice root to a cup of boiling water and simmering for about 20 minutes.