Jigger

(Tunga penetrans)

A jigger is a small flea that infects humans and pigs and is found in more tropical parts of the world. It is different from most fleas because the adult female burrows into the skin of the host and remains indefinitely rather than jumping from host to host. The female flea may cause extreme itching, pain, and inflammation. Surgical removal is usually the recommended method for relief. The image at left depicts a human foot that has been severely infected by jiggers. In this case, surgery is definitely necessary.

Source: Ohio State