There’s a common fungal infection that both humans and animals called ringworm. Despite what the name might suggest, there aren’t any worms associated with this medical condition. If you suspect that ...

Pinworms are small, thin, pin-shaped worms that sometimes live in the human colon and rectum. They're also called threadworms. They're about 1/4- to 1/2-inch long — about the size of a staple.