Living on 32 acres in the SW Arkansas Ouachita Mountains, this is daily life for us.
Every. Single. Day.
We've actually stopped trying to kill the little varmints and started actively breeding them. We're hoping to get a contract to start supplying stock to the annual Southwestern Chigger Rodeo events held locally here in the South Central U.S.
We've got a bull chigger that's gonna go all the way to the national finals this year. The wife went out to feed him a couple of days ago and come to think of it, that's the last time I saw her. I wonder....
Seriously, with a LOT of research behind us, the only real "temporary" relief we've found is "HOT" showers/baths after you get the bites. As HOT as you can stand. You'll get about 3-4 hours relief. It really doesn't matter whether you add bleach/oatmeal/etc into the water, the critter(s) are already gone, you're just treating the bite. Nail polish, hair spray, suffocation "stuff" isn't gonna kill anything, because there isn't anything there left to kill. Honest.
There are many, many links but here's just one to start:
Trombiculosis - Wikipedia, the free encyclopedia
You would think a person would eventually become somewhat immune to the itch, but if ever there was a definition for "excruciating", a chigger bite would be it.
We cover up, spray down with Deep Woods Off, grit our teeth, step off the porch and Let the Games Begin!