You can use it on your skin

Oregano oil is helpful for skin conditions like cold sores, muscle aches, nail fungus, joint pain, and dandruff. Try diluting it with a carrier oil like jojoba, sweet almond, or grapeseed, at 10 to 12 drops oregano oil per ounce of carrier oil. However, don t use oregano oil on broken or sensitive skin, as it can be irritating. There is some anecdotal evidence suggestions that itmay be effective for treatment of psoriasis, an inflammatory skin condition, but no published research yet.