-
Sounds like runner’s lice. They gravitate to the damp warmth of shoes post-run. When you next wear the shoes the lice work their way through your socks and anchor to your feet with barbs that double as ovipositors. The larvae incubate subcutaneously causing a blister-like appearance as they expand. They hatch while the host is sleeping and head off to find some shoes. You’ll experience pins and needles from the mild toxin that’s released, and a temporary delusion that you can hear the ground moaning as you step on it.
Anyone ever get weird blisters on the side of their heels? Not from rubbing, almost feels like the impact is forcing the skin apart. They’re quite deep, unlike normal blisters. Trying to resist hacking them apart.