chiggers

<dermatology> A skin infestation, common in the southern United States, caused by the larva of the red mite (harvest mite). Features include an itchy red rash to the waist, ankle and skin folds. No specific treatment is necessary as the rash will resolve spontaneously. Antihistamines can be used to control itching. ... (05 Jan 1998) ...
Found on http://www.encyclo.co.uk/local/20973

Chiggers

Harvest mites. These are small orange-red mites that cause intense itching, particularly on the feet, at harvest time.
Found on http://www.cats.org.uk/cat-glossary/

chiggers

Common name for Trombiculidiasis.
Found on http://www.vetmed.wsu.edu/glossary/glossary.asp
No exact match found