chigoe

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A small tropical flea (Tunga penetrans), the fertilized female of which burrows under the skin of animals and humans, causing intense irritation and sores that may become severely infected. Also called chigger, jigger², sand flea.
2. n. See chigger.

Century Dictionary and Cyclopedia

1. n. A very curious insect of the order Aphaniptera, or fleas, and family Pulicidæ, Pulex or sarcopsylla penetrans, closely resembling the common flea, but of more minute size, found in the West Indies and South America. The female burrows beneath the skin of the foot, and soon acquires the size of a pea, its abdomen becoming distended with eggs. If these eggs remain to be hatched beneath the skin, great irritation and even troublesome sores result. The insect must be extracted entire, and with great care, as soon as its presence is indicated by a slight itching or tingling.
2. n. A larval harvest-mite, as the so-called Leptus irritans. Same as red-bug and jigger, 2.

Wiktionary

1. n. A small tropical flea, Tunga penetrans, whose females burrow under the skin of animals, including humans, and lay their eggs, causing strong irritation and sores.

GNU Webster's 1913

1. n. (Zoöl.) A species of flea (Tunga penetrans, formerly Pulex penetrans), common in the West Indies and South America, which often attacks the feet or any exposed part of the human body, and burrowing beneath the skin produces great irritation. When the female is allowed to remain and breed, troublesome sores result, which are sometimes dangerous. See jigger.

WordNet 3.0

1. n. small tropical flea; the fertile female burrows under the skin of the host including humans