Small white ball the size of corn in my stool! What is it??

I have passed a firm small white ball the size of corn in my stool. It is firm, and upon inspection has a hole in the center. I pushed down on it and white liquid came out. This has happened a few times. I have not eaten anything that looks like this. My medicine is in pill form.
WHAT the heck could it be? No diahrea or pain. Tweet