Did a bit more research on my morphea. A few years ago, they didn't know much about it, other than it wasn't systemic. But, I found something today called Deep Morphea or subcutaneous morphea that can cause SFN, High ANA Titers, some esophageal involvement, the itching and hyperpigmentation!
With General morphea, the "patch" usually goes away after a few years. I've had mine since around 1973! I can tell just by looking at it that it involves deeper tissue because if I compare it to the other side (inner knee) it's very concave unlike my normal knee which is slightly convexed!
I'm going to look into this much deeper, but I'm starting to think this may be it.
Thanks again for all the info, and for not letting me ignore this!