Hi Michelle,
It sounds like it's related to your circulation since it's below the
shortgrippers and above the socks (i.e. the socks and shorts are
constricting and restrict circulation). Makes even more sense that it
occurs in the hot and humid weather because your body circulates more
body fluids to the outer tissues/skin to keep cool.
I too have experienced exactly what you describe (even on shorter
rides). I showed it to a physician and he conferred with me (I am
otherwise healthy). What has helped is getting larger shorts (I have
even cut or trimmed the gripper on some shorts) to reduce the
constriction on the thighs, not wearing socks, and when recovering off
the bike, elevating my legs, using cold compresses.
I experience the same thing walking/hiking for hours in summer heat
(in loose clothes, not bike togs). The rash appears above my socks all
up my calves but not my thighs (I don't wear gripper or constricting
shorts when hiking). When I get it, the splotchy red inflammed areas
burn like fire when I bathe them in cold water, and they don't not
fully recover until I rest off of my feet in the cool for a few days.
You should see a doctor to rule out any underlying medical
conditions.
Good luck (and good health!).
Jenny
Jenny Hegmann, MS, RD
Consulting and Sports Dietitian
The Cyclist's Food Guide: Fueling for the Distance
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