Tea tree oil is native to Australia and has been used here for generations. It's also the essential oil people are most likely to use neat, straight from the bottle onto a spot, which is exactly what you shouldn't do. Used properly, it's a useful addition to a blemish routine. Used carelessly, it causes the irritation it was meant to help.
Why dilution isn't optional
Essential oils are extremely concentrated plant extracts. Tea tree is potent enough that applying it undiluted can cause redness, burning, peeling and, with repeated use, contact sensitisation, where your skin develops a lasting reaction to an ingredient it previously tolerated. Once that happens, it doesn't usually un-happen.
Dabbing neat oil on a spot every night is the fastest way to get there. Dilution isn't watering down the benefit, it's what makes the oil usable at all.
Safe dilution ratios
Dilution means mixing the essential oil into a carrier, something like jojoba, sweet almond or fractionated coconut oil, or an unscented gel or moisturiser.
- Spot treatment on adult facial skin: around 1 to 2 percent. That's roughly 1 to 2 drops of tea tree in a teaspoon (5ml) of carrier.
- Wider application across the face: stay at 1 percent or below.
- Body, such as the back or chest: up to 3 percent is generally tolerated, so about 3 drops per teaspoon.
- Sensitive or reactive skin: start at 0.5 percent and see how you go.
Mix small batches. A teaspoon lasts a surprisingly long time for spot use, and diluted oils don't keep indefinitely.
Always patch test first
Before it goes anywhere near your face, put a little of the diluted mix on the inside of your forearm, leave it for 24 hours, and check for redness, itching or bumps. Do this even if you've used tea tree before, since sensitisation can develop over time.
How to use it
- Cleanse and pat dry.
- Using a cotton bud, apply the diluted mix directly to the blemish, not the surrounding skin.
- Let it absorb for a minute, then continue with moisturiser.
- Use once daily to start, in the evening. Twice daily only if your skin is clearly handling it.
Give it time. Expect several days before you see a difference on an individual spot, and don't apply it more often out of impatience.
What not to combine it with
Avoid layering tea tree over benzoyl peroxide, retinol or exfoliating acids on the same area at the same time. Each is drying in its own right, and stacking them makes irritation almost certain. If you use a retinol, put tea tree on a different night.
When to skip it entirely
- On broken, raw or freshly picked skin.
- Anywhere near the eyes, lips or inside the nose.
- On young children, without professional guidance.
- During pregnancy or breastfeeding, unless you've checked with your healthcare provider.
- If you've had any reaction to it before.
Tea tree oil must never be swallowed. It's toxic when taken internally, and bottles should be stored well out of reach of children and pets.
When to see someone
Tea tree is for the occasional blemish. If you're dealing with widespread or cystic breakouts, painful lumps under the skin, or anything that's scarring, that's a conversation for your GP or a dermatologist rather than a bottle of essential oil.
This article is general information only and isn't a substitute for advice from a qualified healthcare professional. If you have a persistent skin concern, please speak to your GP or dermatologist.