Hi, Mikel. I'd say welcome to the forum, but I think you've posted here before.
I had the same thing happen to my calves after bilateral hip replacement. They were a mottled dark red with a yellow tone. I was told that it was iron that was settling there, though I don't know how accurate that was. I believe it's a circulation issue, too. When I started walking more, it went away, though it took over a year. The itching could be liver related.
Hugs,
Connie