You can get hotfoot on platform pedals, too.
The big issue is compression on the nerves that run through the ball of your foot (kind of between the "knuckles" of your foot)
Anything that will squish that neighborhood too much can cause hotfoot. Tight shoes/socks, concentrated pressure, swelling feet, dropped metatarsal heads, no metatarsal arch support, Morton's Neuroma, constant pressure, high heel shoes.
You can even get hotfoot on a stairclimber or eliptical trainer or barefoot on your kitchen floor while doing calf raises.
As long as you know what it is (someone is getting squished in your forefoot) you can play around with the conditions your forefoot experiences until you find the cause.
Sometimes feet just get juicy after you ride a while, and you need to loosen the laces partway through a ride.
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