Disney Rash as Bad in DL?

[cheryl.UK]

I get it every time. I've tried everything but I've narrowed the causes down to my ankles and calves getting over hot in humidity. Those worst I've had it was in NY in August. It's worse if I wear sneakers with or without socks as they make my feet hotter. I only wear sandals now and make sure I spend time in the pool every day. This seems to keep it to a minimum.