Several studies have proven that this essential oil, when applied topically, will act on patches, alleviate itching and then redness. It is therefore recommended for certain skin conditions such aseczema or rosacea.
Regarding the effectiveness of this essential oil against acne marks, to date, few studies have demonstrated this action. In fact, the studies conducted on this subject involve formulas based on tea tree essential oil added to other ingredients.
For instance, researcher MAZZARELLO and his team have demonstrated that a cream containing 3% tea tree essential oil, 20% propolis, and 10% aloe vera is more effective in reducing acne and erythematous scars than a synthetic preparation based on erythromycin, a commonly used antibacterial antibiotic in acne treatment. It is also worth mentioning another study conducted in 2013, where researchers examined the antimicrobial and anti-inflammatory effects of a blend composed of 3% tea tree essential oil, 2% lavender essential oil, and 95% jojoba vegetable oil. The total number of inflammatory lesions was significantly reduced in the subjects treated after 4 weeks.
However, these studies do not allow us to judge the "anti-mark" effect of tea tree essential oil alone.
In all instances, the use of tea tree essential oil is highly effective in reducing acne flare-ups, which helps to lessen their severity and thus the risk of scarring.
Furthermore, a recent study from 2023 defines this essential oil as an effective natural ingredient for reducing post-inflammatory acne marks and promoting healing.