I've used the word "jigger" and "chigger" interchangeably all my life. Because I'm curious I finally looked them up and find that they're two different insects/arthropods
. Who knew? Not me!
Known medically as tungiasis, tropical jigger
infections should not be confused with chigger
bites. Chiggers are Trombicula alfreddugesi larvae. Jiggers are female sand fleas (Tunga penetrans) that burrow in the skin of people's feet and lower legs with the purposes of laying their eggs.
Jiggers who take root raise white lesions with black dots in their centers that can cause intense pain and itching. Options for treating jigger infections include surgical removal, suffocating the fleas by covering the black dot (i.e., the flea's air hole) with an airtight wax dressing, or applying thiabendazole, ivermectin (e.g., Stromectol from Merck) or metrifonate cream. Untreated jigger infections can lead to the development of tetanus, cellulitis and gangrene."
Information About Tropical Skin Disease | eHow