Also called harvest mite, redbug. the six-legged larva of a mite of the family Trombiculidae, parasitic on humans and other vertebrates, sucking blood and causing severe itching and acting as a vector of scrub typhus and other infectious diseases.
Also, jigger.

1735–45, Americanism; variant of chigoe Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chigger (ˈtʃɪɡə)
1.  (US), (Canadian) chigoe, Also called: redbug the parasitic larva of any of various free-living mites of the family Trombidiidae, which causes intense itching of human skin
2.  another name for the chigoe

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1756, from W.Indies chigoe (1668), possibly from Carib, or of African origin (cf. Wolof and Yoruba jiga "insect").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chigger (chĭg'ər)

  1. The six-legged larva of mites of the family Trombiculidae, parasitic on humans and other vertebrates and inflicting a bite that produces a wheal accompanied by intense itching. Also called harvest bug, harvest mite, jigger, red bug.

  2. Chigoe.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If not dislodged, the chigger will feed for several days.
The inflamed areas resemble chigger bites, but differ in distribution on the
Treating clothing and shoes with a repellant may also help prevent tick and
  chigger bites.
To ease the pain and itching of chigger bites, rub with a moist aspirin tablet.
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