Can you put undiluted oils directly on your skin?

In general this should be avoided, and oils should only be used with a recommended dilution based on the particular situation of the person and use of the oil (usually 1 to 3%). A few oils, including lavender, tea tree, ylang ylang and sandalwood, are mild enough to be considered for direct application, but even with these oils, we recommend doing a skin-patch test and using caution.