I think it has more to do with the humidity. I just came back from a tropical country with warm and very humid weather. While there, my feet "plumped up" (not sure if this is the correct term but I hope you get what I mean) and I virtually felt no symptoms. Now, back at home, where the summer weather is hot but a lot less humid, my feet have "shrunk" and are back to looking dry, papery, and wrinkly. Neuropathic symptoms have come back too .