Dilution and the patch test

Essential oils are concentrated plant extracts. Undiluted, they can irritate skin, and repeated contact can make a person sensitive to an oil they tolerated before. Diluting in a carrier oil spreads the oil out and slows its absorption. It is the single most useful habit in this whole library.

Dilute, every time

Mix in a carrier oil (how to choose one), not in water. Oil and water do not mix, so droplets of undiluted oil stay on the skin.
Use the dilution calculator for the number of drops.
Do not apply an essential oil to skin straight from the bottle.

The patch test, step by step

Make a small amount of the exact blend you plan to use.
Put a coin-sized dab on the inner forearm and leave it uncovered or under a bandage.
Leave it for 24 hours and do not wash the spot more than you must.
Redness, itching, swelling or a rash: wash the spot with unscented soap and water, do not use the blend, and see a health professional if it does not settle.
Nothing after 24 hours: the blend is reasonable to try on a larger area. A patch test lowers the risk; it does not remove it. Skin can react later, after repeated use.

If a reaction happens

Stop using the oil, and any blend containing it.
Wipe the area with a little plain carrier oil, then wash with soap and water. Water alone does not lift oil.
Eye contact: flush with carrier oil on a tissue first, then rinse with cool water, and get medical help if it continues.
Swallowed: do not make the person vomit. Call your poison control centre or a doctor straight away and keep the bottle to hand. In Canada call 1-844-764-7669 (Quebec: 1-800-463-5060).

Please note: this guide is general information, not medical advice.

Sources

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