i have pitting edema and diabetes, also high blood pressure. I take a diuretic, metformin and and lisinopril. I just took a trip to nyc and did more walking than I am used to. plus I wore socks and tennis shoes, which i hardly ever wear. two nights ago, i noticed a little red spot on the top of my ankle on my right foot, tonight i have red spots on both feet around the ankles. the spots don't itch, but i am worried about them. could it be a heat rash, or should I call my doctor in the morning for a check up? i do not have any other symptoms like fever etc.. oh, plus my feet hurt on the bottoms emormously...