What is tea tree oil in skincare?
Tea tree oil is an essential oil steam-distilled from the leaves of Melaleuca alternifolia, an Australian shrub used medicinally by Aboriginal communities long before it reached Western pharmacies.
Its active constituent is terpinen-4-ol, which accounts for most of its antimicrobial and anti-inflammatory activity. Quality varies considerably between products, and oil that has oxidised is both less effective and more irritating.
What skin concerns does tea tree oil treat?
Acne is its best-supported use. A comparative trial against benzoyl peroxide found 5% tea tree oil produced a similar reduction in inflamed lesions, more slowly but with markedly fewer side effects.
It is also used for fungal conditions such as athlete’s foot and nail infections, for dandruff, and for insect bites and minor wounds. Its antibacterial and anti-inflammatory action makes it a reasonable spot treatment.
What ingredients are best paired with tea tree oil?
Never apply it undiluted – dilute to around 5% in a carrier such as jojoba or squalane. Pair it with niacinamide and salicylic acid for acne, and with ceramides to protect the barrier.
It is not suitable for delicate or very sensitive skin, and allergic contact dermatitis is relatively common, so always patch test. Store it in dark glass; oxidised tea tree oil is a well-documented sensitiser. Take our Skin Quiz.
What are acne scars?
Acne scars are permanent changes in skin texture left behind after inflammatory acne damages the dermis. They fall into two families: atrophic scars, which sit below the surface as ice-pick, boxcar or rolling depressions, and hypertrophic or keloid scars, which sit raised above it.
What most people call scarring is often post-inflammatory hyperpigmentation or erythema – flat brown or red marks with no texture change. Those fade on their own; true atrophic scars do not.
What causes acne scars?
Scarring happens when inflammation reaches deep enough to destroy collagen and the repair process either lays down too little (atrophic) or too much (hypertrophic). Deep nodular and cystic lesions carry the highest risk.
Delaying treatment, picking or squeezing, and prolonged inflammation all increase the odds. Genetics play a large part in who scars and how, which is why two people with identical acne can heal very differently.
What ingredients are best for acne scars?
For flat marks, ingredients that speed turnover and calm pigment work well: retinoids, vitamin C, niacinamide, azelaic acid, alpha arbutin and AHAs, with daily SPF to stop marks darkening again.
For true textural scarring, topicals can soften but not erase – retinoids and peptides help remodel collagen over months, while in-clinic options like microneedling, resurfacing and subcision do the heavy lifting. Preventing new inflammation is the highest-value step. Take our Skin Quiz.
