I brought in photos and a list of symptoms. If you go to someplace like Mayo, you’ll be asked for previous medical files and imaging that pertains to your case. But, my doctor took one look at my photos and said it looked like Erythromelalgia. Mayo tends to see the rare disorders at a higher frequency, so that was to my benefit. They also asked me to go get my blood drawn to rule out any other disorders or identify any other co-existing rheumatoid conditions. Good luck with everything.