Wow - this is THE ONLY product that has EVER worked on my cystic acne. I apply more than directed, about 3 drops, to the deep, red cystic bumps on my jawline and cheeks. I was shocked that overnight the cysts shrunk and dried up. I’ve never had such an incredibly quick resolution to my acne! In ten days the extensive acne all along both lower cheeks and jawline had completely disappeared and there were no scars!! I always get scarring, this was such a miracle. This also significantly brought down redness. The serum smells strongly of thyme and the scent does linger for about 20 minutes afterwards. I personally love this aroma, but just an fyi. If any of your skin is broken or bleeding, this will sting when applied. On unbroken cysts, I feel a cooling or slightly tingling sensation.