Aura Cacia Tea Tree - Some of the most effective aromatherapy uses for tea tree oil are cosmetic in nature. For instance, tea tree has a marked oil dissolving and dispersing action, which can help alleviate overly oily secretions of the skin. This oil can soothe cuts, scratches, sunburn and cold sores. Because it's non-irritating, a single drop of the oil can be applied directly to minor injuries once or twice a day.