It's amazing the technology that we have available, often cheaply. I'd had some suspected infection in my leg one time, where it looked pinker (sunburned?) compared to the other, and I thought it felt warmer. I happen to have a cheap thermal camera, so took some false-color images compared to the other leg, showing that it was indeed warmer. It was great fun to show the doctors, who had to ask, "what exactly am I looking at?" Antibiotics took care of it, whatever was going on.