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 essential oil is one of the more well-known essential oils for acne-prone skin. Its antibacterial properties help ward off acne-causing bacteria and assist wound healing. It also helps to regulate oil production, which can decrease the severity and incidence of breakouts.