A species of flea (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.
- 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.
- See chigger.