Cover up your real face with your beautiful skin, it means if you see someone so kind or so good, you cannot judge him/her by the first meeting, so you have to see through his/her mind, probably, you will see something you do not want to face from someone you have entirely trusted.

I used the word tear because I want to manifest the feeling when you tear a sheet of paper for unwrapping a present meanwhile you may think "This gift wrapping paper is so beautiful, I will see a great stuff inside also!" Unfortunately, there is no great thing inside, I just got the thing that I do not like to own.