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Naval stones.

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.

RELATED: This giant wad of ear wax is as gross as it comes.

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.

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