I Was Diagnosed With Morphea Last Year After I Developed

I was diagnosed with morphea last year after I developed a purple patch of skin under my left breast. They did a biopsy. They gave me a cream to use. The morpea spots now have spread over my abdomen and both breasts and the back of my thighs. I'm getting a few red spots on my face. My question is what kind of doctor should I see for this, a dermatologist or a rheumatologist. I am in Arizona for the winter so I'm not by the derm that made the diagnosis. I should mention that the breast where it started is the one I had cancer in. I had chemo and radiation 8 years ago.