This old-timer was in the parking lot at Anahuac National Wildlife Refuge in Texas, in bib overalls and boots. He looked like the kind of guy who would know about chiggers.
Chiggers have been and are a concern of mine. They like many of the same places birds like.
Minnesota has chiggers, not that I've ever encountered them here. My agonies all have been in Texas, which I regard as Chigger Central.
Jude and I were in Texas for an American Birding Association convention. We had been afield, and now were at the refuge. I had such a severe case of chigger bites that the night before I had visited a hospital emergency room, begging for mercy. I got a shot and a prescription (and two weeks later the itching stopped).
Chiggers are mites, distantly related to spiders. All but invisible without a magnifying glass, chiggers lurk in tall grass and on brush. It is the chigger larvae that get you, sensing the carbon dioxide you exhale, then climbing aboard to seek a warm, soft place to bite.
Chiggers head for places on your body where the flesh is thin, tender or wrinkled. That pretty much describes too many of us. Chiggers like the skin beneath your socks, waistbands and underwear. Chiggers in a rush will bite your ankles and calves.
The larvae inject you with their saliva, which dissolves some of your skin. The chigger then sucks up skin cells. A red welt appears. The U.S. Army chigger website (yup, there's an Army Web page on chiggers) says the welt itches intensely. That is an understatement.
The fellow in the parking lot said, indeed, he had a solution for chiggers.