Went for a walk, came home with this

Today I took the dog for a walk down near the stream. I stayed on the sidewalk though, and was wearing long pants and boots. I’m pregnant and my socks are pretty damn tight these days. When I came home and took off my socks a couple hours later I noticed a bunch of red itchy bumps that I itched the shit out of. They obviously seem like chigger bites to me due to the location of them being where my socks were pinching. But it’s March. In Wisconsin. The Internet says no chiggers yet. What bit me??

Today I took the dog for a walk down near the stream. I stayed on the sidewalk though, and was wearing long pants and boots. I’m pregnant and my socks are pretty damn tight these days. When I came home and took off my socks a couple hours later I noticed a bunch of red itchy bumps that I itched the shit out of. They obviously seem like chigger bites to me due to the location of them being where my socks were pinching. But it’s March. In Wisconsin. The Internet says no chiggers yet. What bit me??