External oil of oregano could be a good thing. My number one suggestion would be quality colloidal silver internally and either colloidal or ionic silver externally. That should do the trick. Just be careful when you get them - so many of the products are more hype than help. You can get both colloidal and ionic silver of the highest quality at CureZone sponsor Utopia Silver (scroll down to the bottom of the page - they are in the sponsor's box).