Hello! I have had this pimple-like thing on my back for many years now. If I sqeeze it something white like fat comes out and when it is all out , a hole is left. I have to do the same thing over and over. For some time now it is bigger and more fatty thing comes out, it is not a pimple. I thought it was a hole that keeps getting filled with things from outside, but now I believe that is fat from my body coming out. It is about 2 mm in diameter, the hole I mean. I am worried it might be something else, more serious.