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Just the term navel stone conjures up all kinds of unsightly images.

Unfortunately, nothing you could dream up could prepare you for what comes out of this guy’s belly button.  According to experts, navel stones are the result of masses made up of sebum and keratin deposits hardening into stone-like formations. Dermatologists warn that personal hygiene should extend to cleaning in and around the belly button regularly.

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So if you happen to have “innie” belly button that forms what’s essentially a miniature cave in your stomach, you’d be best served to pay particular attention to cleanliness in and around that area. Otherwise, you could have some sort of alien growing in there like this dude.