Human botfly larvae, for example, burrow under your skin, forming a pus-filled pimple. Meanwhile, thousands of young Loa loa worms can travel throughout your body —even across your eyeball!

It was from animal faeces that I ended up getting a worm inside me, and under my skin. "You could see it. I would itch and then you could see this worm moving under my skin. I got quite attached ...

Each worm is composed of 60 to 150 different segments covered by hollow bristles that easily get stuck in human skin and ...