Neat Application

Warning: Applying any sort of essential oil to the skin without diluting it first can result in permanent sensitivity. Even oils that are thought to be safe for neat application should not be applied without dilution to the skin often. Even a single drop of an essential oil can result in the development of a permanent sensitivity to that plant. A neat application is when an essential oil is applied undiluted to the skin. There are very few cases in which a neat application can be safe. Oils that are phototoxic should generally never be applied neat. Hot oils should never, under any circumstances, be applied neat to the skin. Even oils that are safe for neat application should be applied with caution. If using any new oil, do a patch test of the oil combined with a carrier oil beforehand. If skin irritation occurs, flush with carrier oil. Do not use water, as water will just force the oil further into the skin and make the irritation worse. Any neat applications should start with small amounts of oil.

It has been speculated that the following oils can occasionally be applied neat: