I have a red rash that developed over the last year on the left side of my neck. I have a scar there from a upper cervical surgery to years ago. I thought it may be discoloration from that. Recently, the rash is on the right side, too. I take thyroid med as I have an underactive thyroid. My Dr wants to treat this as a dermatology issue. I think not. What tests should I be asking for? It has more of a "burn" feeling to it. It is also going down the lower neck area. Thank you, Noel West