Do not use pure essential oils on the skin. They can cause sweltering, skin irascibility and photosensitivity. There are a few exclusions to this rule: it is suitable to use the nonirritating oils lavender or tea trees undiluted on burns, insect bites, pimples and other skin eruptions-as long as you do not have extremely sensitive skin. The oil will not irritate the skin, and will still enter the body.
Use only pure essential oil from plants.

Test for sensitivities. Most people with sensitivities to artificial smells are not sensitive to high-quality essential oils. Also people who are allergic to, say, chamomile tea will not essentially be allergic to the essential oil. If redness or itching develops, you may want to try a less potent dilution, or choose an appropriate substitute for the irritating oil.

Use with caution those essential oils that are irritating to mucous member and skin. Keep all essential oils away from the eyes.

Keep all essential oils out of the reach of young children; older children can be taught to respect and properly use essential oils, but they should nevertheless be supervised.

In general, when treating children with essential oils use one-third to one-half the adult dosage and select only nontoxic oils. Use essential oils cautiously with those who are elderly, convalescing, or have serious health problems such as asthma, epilepsy or heart disease.