I actually have what sounds like to be the same problem. I visited my very expensive dermatologist to find out that it is a form of psoriasis. I was advised approx. 3 years ago to start using Head and Shoulders or any shampoo that contains pyrithione zinc. I know it sounds simple, but since using the shampoo I have definetly noticed a difference in my facial area. You might try this simple solution before having the test done.
Hello,
If you believe it is a fungal infection, then you can get a fungal KOH examination of the skin scrapings and biopsy of the skin to confirm the diagnosis. Without examination, it is difficult to confirm a diagnosis.
I hope it helps. Take care and regards.