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.

Kristin Cavallari said she pierced her belly button with a safety pin when she was in eighth grade, which left her with a “crazy scar” The Laguna Beach alum, 38, said she and some friends “took safety ...