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 great for oily and sensitive skin. For acne sufferers, this oil is known to be as effective as benzoyl peroxide but without the harsh side effects. Like lavender oil, it has anti-fungal and antibacterial qualities.