Earwax, boogers, toenail fungus — the body can be pretty gross sometimes. Don’t forget to add “belly-button gunk” to that list. And when you see something in there, you probably want to get it out.

If your belly button is leaking fluid, you may have a bacterial, fungal, or yeast infection. But other things, such as cysts and poor hygiene, can also cause your belly button to leak fluid. Obesity ...