That's interesting, in my mid 20's the area above my ears also became itchy and flaky, inflamed, just like you describe, and it lasted for years. My hair started thinning out in that area as well, and I was generally not feeling well. In my early 30's I started noticing correlation between eating wheat products, especially anything with white flour, and the symptoms flaring out/getting worse in the next few days. I started removing all foods with gluten from diet (which I found pretty easy actually, basically no more bread and stick to rice, sweet potatoes, beans and fruits for starch) and the symptoms disappeared almost entirely over a few weeks. I started supplementing with daily vitamin D and started to feel even better. I would experiment with removing gluten from your diet and vitamin D supplementation to see if the symptoms improve over a 2-3 week time frame, if you haven't tried already.
