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.
Tea tree oil is a popular over-the-counter treatment thought to kill bacteria and fungi. It is used for a variety of skin maladies in people, including fungal infections, acne, boils, burns, corns and insect bites. The oil also is sometimes added to bath water or vaporizers to treat respiratory disorders.