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Tea Tree Oil for Acne: How to Use It and What to Expect

Tea tree oil is a popular natural spot treatment. Small trials suggest a 5% gel may modestly help mild acne. Here is what the research shows, how to use it and its risks.

Edited by Anmar ArabPublished 18 October 2026, 7 min read
On this page
  1. Quick answer
  2. What the research says
  3. How to use it
  4. Possible side effects and interactions
  5. Who should be careful
  6. When to see a doctor
  7. Frequently asked questions

Quick answer

Tea tree oil comes from the leaves of Melaleuca alternifolia, a tree native to Australia. It is a common ingredient in spot gels and face washes sold for acne.

  • Does it work? A handful of small trials suggest that a gel containing 5% tea tree oil can modestly reduce spots in mild to moderate acne. The US National Center for Complementary and Integrative Health (NCCIH) says more evidence is needed before firm conclusions can be drawn.
  • How it compares: Mayo Clinic notes it may irritate the skin less than benzoyl peroxide, a standard pharmacy acne treatment, but it may work more slowly.
  • Safety: used on the skin, it is tolerated by most people, but it can cause redness, stinging, dryness and allergic rashes. It is poisonous if swallowed.
  • Bottom line: a ready-made 5% product may be worth trying for a few mild spots. It is not a substitute for proven treatments if acne is widespread, painful or leaving scars.

What the research says

A placebo-controlled trial. The best-known study was published in 2007 in the Indian Journal of Dermatology, Venereology and Leprology. Sixty people with mild to moderate acne were randomly given either a 5% tea tree oil gel or a placebo gel for 45 days, without knowing which they had. The tea tree group had a much greater improvement in total spot count and in an acne severity score than the placebo group. Side effects were similar in both groups and described as tolerable. This was a single small, short study, so it cannot show how well tea tree oil works over months or in more severe acne.

A 2023 review across all uses. Researchers reviewed randomised trials of tea tree oil for any health use, published in Frontiers in Pharmacology in 2023. They found 46 trials in total, but judged the quality of the research to be poor to modest. For acne in particular, they concluded the evidence was not sufficient to show a benefit. Side effects were reported in most studies but were usually minor, while concentrations of 25% or more applied to the skin caused more serious reactions.

A 2026 meta-analysis. A more recent analysis in Phytotherapy Research pooled seven acne studies with 445 patients. It found tea tree oil was linked to a modest reduction in acne severity compared with control treatments, and that side effects were mostly local and mild. The authors called for larger, better-designed trials using standard products and longer follow-up.

What health authorities say. NCCIH's fact sheet, last updated in 2025, says a small amount of research suggests tea tree oil may help acne, but more evidence is needed. Mayo Clinic says a 5% gel may help relieve acne and may be gentler than benzoyl peroxide, but slower to work. The NHS acne page does not list tea tree oil among its recommended treatments; it points people to pharmacy products such as benzoyl peroxide and salicylic acid.

A note on mouth care. Tea tree oil is also added to some mouthwashes. The 2023 review found that mouthwashes containing 0.2% to 0.5% tea tree oil may reduce dental plaque, and that a 5% gel may help as an add-on to professional deep cleaning for gum disease. NCCIH, however, describes the effect on gum inflammation, plaque and bad breath as uncertain. Because NCCIH warns that tea tree oil should never be swallowed, only products made for use in the mouth belong there.

How to use it

No official dose has been set, so the safest approach is to follow what was actually tested:

  • Choose a ready-made product. The main trials used gels containing 5% tea tree oil. Pick a skin product that states its tea tree oil percentage, rather than a bottle of pure oil.
  • Do not use it neat. Undiluted oil is not what the acne studies tested, and stronger concentrations were linked to more serious skin reactions in the 2023 review.
  • Try a small area first. As a simple precaution, test a little on a small patch of skin to check it does not sting or turn red before using it more widely.
  • Apply to clean skin. The NHS advises washing acne-prone skin twice a day with a gentle cleanser and avoiding scrubbing, which can make acne worse.
  • Give it time. Acne treatments take weeks to show results. The placebo trial lasted 45 days, and Mayo Clinic notes tea tree oil may act more slowly than benzoyl peroxide.
  • Store it properly. NCCIH says skin reactions are more likely with old products or ones that have been exposed to heat, light or air, so keep the cap closed and replace old products.
Tea tree oil is poisonous if swallowed, even in small amounts. Keep it away from children, never use it inside the mouth unless it is a product made for that, and get urgent medical help if someone swallows it.

Possible side effects and interactions

Most people tolerate tea tree oil products on the skin, but side effects do happen:

  • Skin irritation: redness, itching, stinging, burning and dryness, according to Mayo Clinic.
  • Allergic reactions: Mayo Clinic lists an allergic skin rash (dermatitis) as a possible side effect.
  • More irritation with old products: NCCIH says reactions are more likely when the oil has aged or been exposed to heat, light or air.
  • Poisoning if swallowed: NCCIH lists confusion, being unable to walk or stay steady, and coma. Mayo Clinic adds breathing problems.

Mayo Clinic says tea tree oil is not known to interact with medicines or supplements. If you already use a prescribed acne treatment, ask your doctor or pharmacist before adding another product to your routine.

Who should be careful

  • People with eczema or very sensitive skin. Mayo Clinic advises against using tea tree oil if you have eczema.
  • Anyone who has reacted to it before. Stop using it if it causes a rash, and do not use it again.
  • Children. It must be kept out of reach because of the risk of swallowing it. Ask a doctor before using it on a child's skin.
  • Pregnancy and breastfeeding. NCCIH says products applied to the skin may be safe, but it is sensible to check with a midwife, doctor or pharmacist first.

When to see a doctor

Tea tree oil is only suitable for mild acne. The NHS advises seeing a GP if:

  • you have tried treating acne yourself and it is not getting better
  • you have lots of spots
  • your spots are deep, painful or leaving scars
  • you have signs of a skin infection, such as hot, swollen and red skin
  • acne is affecting how you feel about yourself or your mental health

Stop using tea tree oil and seek medical advice if you develop a spreading or blistering rash, swelling, or severe burning. Get urgent help if anyone swallows tea tree oil.

Frequently asked questions

Can I put pure tea tree oil directly on a spot?

It is not recommended. The acne studies used gels with about 5% tea tree oil, and the 2023 review found that concentrations of 25% or more caused more serious skin reactions. A ready-made spot product is a safer choice.

Is tea tree oil better than benzoyl peroxide?

There is no good evidence that it works better. Mayo Clinic says it may be gentler on the skin but slower to work. Benzoyl peroxide and salicylic acid are the pharmacy treatments the NHS suggests trying first.

How long does tea tree oil take to work on acne?

In the main placebo-controlled trial, people used a 5% gel for 45 days. Expect several weeks before judging whether it helps, and see a doctor if acne is getting worse.

Is tea tree oil mouthwash safe?

Some mouthwashes contain small amounts of tea tree oil, and a review found low concentrations may reduce plaque, though NCCIH calls the benefit uncertain. Use only products made for the mouth, spit them out, and never swallow tea tree oil.

References

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