Absolutely appropriate to go to Mayo Clinic. You may get seen sooner through dermatology than rheumatology but once you’re in the door the initial Dr will get other specialists involved. They will need all your medical records from when this problem started. When you call Mayo for an appointment they guide you through the whole process. They request records directly from your doctor with your signed permission. Good luck! Hope you get an appointment soon. They can usually complete a work up and get to diagnosis within a week.