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.
1 For example, there is some evidence that a 5% tea tree oil cream applied three times daily for two months has no benefit. 2  Mild to moderate acne. 3  Applying a 5% tea tree oil gel appears to be as effective as 5% benzoyl peroxide (Oxy-5, Benzac AC, and others) for treating acne.