Variously called Death Day, Decision day, and a number of other less kind words, D-Day was the day that the Allies began the big push from the coast of France all the way to the heart of Germany, ending WWII.
More importantly when it comes to cystic acne, tea tree oil can be harmful to your skin when applied in high concentrations. Some individuals have reported severe skin irritation and allergic dermatitis after applying too much tea tree oil, or applying the proper dose too frequently.
Apply pure tea tree oil directly on blemishes to help fight acne. Essential oils are natural. They are usually organic. And while essential oils are great for aromatherapy, they usually are not good for treating acne-prone or blemished skin.