Hello, I'm not a doctor, but I had something similar that came on rapidly in 2017. At first I tried to gtt an appointment with the doctor I had in 2013-2015 but she had left, and I worked with a NP. Got nowhere for three months mainly because nothing was looked at closely. It is a large system connected to a univesity. I called the main number for dermatology and asked for an appointment and when I was told "new patients have a 4 month backlog". I said I am in the system, but there's no doctor at the location I normally go to. I will go anywhere within the system with a Dermatology MD. Who do you want to see (I pulled up the entire staff directory and said Dr. B__ A__ , the department chair. The receptionist chuckled and said well anyone but him.
I scanned the list and found one MD was Certified in Dermatology, and, Certified in Dermatopathology. It was the best choice in doctors I ever made. She treated on visit 1 with cortisone but insisted I needed to come back in two weeks. There was no imporvement and she took multiple skin biopsies. Then the results were analyzed and reviewed before the diagnosis.
It was nummular eczema and it looked much like yours only mine was everywhere.
Please look at the MD's credentials. A good MD won't simply look, they will do an evaluation. I had wasted four months with a NP dermatologist and a primary care MD. I'm sure they meant well but I was not getting results. My eczema is almost clear but I'm on maintenance medication.
I truly wish the best for you. You will succeed! It's OK to ask the doc how she or he is determining the diagnosis. A good doc will gladly tell you.