What Does A Black Pus Filled Spot On Face Indicate?

i had this thing on the side of my face since summer of 2014. And i never knew what it was. nobody i asked knew what it was. I asked my mom to take me to a doctor to look at it, she said it might not be so serious. Now I m here asking you, what is this thing? its on the side of my face, it s black, but when you squeeze it, it looks like theirs puss in it. when i try to squeeze it, only a little bit of puss comes out. It also feels like something is in there.. I don t what.e