I never knew such a thing existed.
These stones don’t happen often, and could take years to detect, according to a research paper you can find in the National Institute of Health database. What causes them? Poor hygiene, If don’t properly clean that belly button, these stones can form.
This looks like one big stone, and it’s retching when it finally pops. So here’s a lesson to all — pay attention to that little hole in the middle of your belly because it could be hiding a nasty plug.