Black indents inside of navel

[AdrianSmith]

I clean out my belly button regularly. Recently I looked and it appears that two small indents (each about the size/shape of a strawberry seed) directly on either side of one another filled with something black are inside of my navel. I've tried poking at them and once it seemed like pus was coming out, but otherwise they seem too deeply indented to remove the black matter, or maybe it's not removable at all.

Any ideas? The strangest part is that it looks a small nose inside of my navel, but I know it's likely nothing at all.