a flea (Tunga penetrans) of tropical America and Africa: the female burrows into the skin, causing painful sores
See chigoe in American Heritage Dictionary 4
(chĭgˈō, chēˈgō)
noun
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.