Lavender oil and Melaluca are a few of the oils that may be used "neat" (applied directly to the skin without a carrier oil). Some oils may be used neat for wounds, cuts or burns. There's a really great chart on this site, EverythingEssential.me that shows the essential oils and their skin sensitivity.
**Dilution of essential oils is important to reduce skin sensitivity and irritation.**
*FDA Disclaimer: I am not in the medical field, just a woman discovering natural ways to use essential oils to supplement healing in my body. I share what has worked/ is working for me and my family. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent disease. I am a dōTERRA Advocate and may receive a small commission if you decide to make a purchase.