There are many different types of oregano oils; it depends on the origin of the herb. The active antimicrobial/antibacterial components of oil of oregano are called Carvacrol. High amounts of Carvacrol are only found in the Thymus capitatus andoriganum vulgare species of the plant. So the specie you have doesn't have high enough amounts of the antimicrobial/antibacterial component to make a difference. You CAN use this internally as a natural antibiotic and the best part is that it doesn't touch the good bacteria in your gut! It only goes after the bad. P73 Oregano Oil can get super pricey so if you want to start off with a cheaper but effective version, I use Gaia's Oil of Oregano tincture. It doesn't taste good but it works! You can use it 3x/day for the first month and see how you look/feel. It's super powerful stuff; if you want to learn more, you can check out my blog