I still suggest a rheumatologist as your best source of care and answers. As has been said, start with your primary care doctor if your insurance requires that.
I did go to a dermatologist because one of my 1st lupus symptoms was an ugly non-itchy red blotchy rash on my forearms and hands. It started with one spot on each arm, then spread as part of my allergic reaction to Celebrex that the GP put me on for my joint pain. The dermatologist was mystified, did a skin biopsy, and reported to me a week later that the biopsy report said I had an incurable, very disfiguring skin disease that usually started when the patient was a teenager (I was 48). NOT!! By then, I'd seen the rheumatologist who had the insight to notice my symptoms had worsened dramatically after I started taking Celebrex. The rheumy also recognized my rash as being a lupus-type rash. He discontinued the Celebrex. No Celebrex, no rash. Also no explanation as to why I had the initial 2 spots, but my history and elevated ANA lead him to suspect probable lupus.
Yes, insurance companies cover lupus and the diagnostic process. Call your insurance company for any specific answers.
No, there is no cure - yet. What will best help your skin are those 2 things I wrote last time: stay out of the sun, wear a good sunscreen and big hat, etc. for short trips outside.
Go see the doctor - primary or rheumy!! Barbara