As Sherrick mentioned, CHIGGERS
DO NOT BURROW INTO YOUR SKIN.
It's the anticoagulant they inject you with-like a mosquito-that causes the severe itch. The anticoagulant causes a SEVERE pH imbalance and THAT'S what causes the itch.
Meat tenderizer, AfterBite, StingEze all work to relieve the itch. Ammonia works best, believe it or not.
When I lived in Missouri-a chigger state-and I'd go into the woods during chigger season I'd lube the BARE feet and and lower leg-up to the knee-with insect repellent. When the DEET formulas came along it was 100% BYE BYE chiggers. Put your socks on and rub a little repellent on your socks also. Here's another hint: Put insect repellent on your ass also. I learned the hard way that sitting on a stump in the woods while squirrel hunting is liable to get you chigger bites on the ass, too.
The old fashioned way is to rub exposure areas (feet, lower leg, waist) with powdered sulphur. It works, but not as well as a DEET formula repellent.
BTW, if you haven't tried a DEET formula repellent, the stuff is amazing. I have actually watched ticks
jump off my socks after crawling an inch or two along my DEET rubbed ankles.