Nearly there now...
I'd ask him for his advice, but unfortunately he's dead now, bless him. As far as I know, he never messed with Anusol, but he was a stickler for Fybogel
Being dead shouldn't be such a big hurdle to leap, not if you try eating some of the stuff that grows in the hedgrows around Aldermaston. I once got in touch with my great Uncle Herbert, who I didn't even know I had until I came down from the Fybogel addiction. Fybogel cold turkey is a place no-one needs to go to. I was on 3 sachets a day and nodding terms with Bill from Dynorod before getting help.
Bill, the milling swirl is pretty well invisible in the flesh, just a change in direction of the 'grain' left behind I reckon. It could be a greasy lubricant imprint I suppose, but I don't remember anyone sitting on it.
It's one of life's ironies I guess that things that you shouldn't get confused with - grinding paste, Fiery Jack, Anusol, and that stuff for 'embarassing itching' can be mixed together so easily.