So bad, it made my skin completely irritated, never used somethung so bad. I use for less than a minute and my skin was burning, it still hurts after hours of application. I don’t recommend at all, not good. I followed the instructions in the package just like they said. I think the irritation will last a couple of days. There are definitely better ways to get rid of blackheads. Please don’t buy it. Attached is a photo of my face :( you can see the irritation in my chin, nose and forehead.