I always read reviews and even watch YouTube reviews before purchasing. What I noticed in people’s comments is that it leaves a mark or something defective. I haven’t had any negative issues with this product. I wash my face when I shower and the steam opens my pores. After my shower, I don’t leave the bathroom. I gently dry my face then use the machine on my problem areas like my nose and chin. I move the device around and it sucks up all the blackheads without leaving any marks. People with marks on their faces most likely didn’t move the device around, but instead left it on one spot. It’s common sense not to do that. The directions clearly state to not leave it on one spot, but to move it around. This device has done such an amazing job. I love it!