I've had really bad acne since I was young, and I've been to a lot of dermatologists, but there was no effect. So I did PTT as recommended by the person consulting here. I tried it, and I tried it 3 times. To be honest, I wasn't sure about the effect the first time, but the effect was great the 3rd time!!!!! Almost all purulent acne has disappeared. I still have some small acne left... but I'm 1000 satisfied with this!!! The director is very kind and I sincerely recommend it!!!!