I believe this moving had to be from the 70sor early 80s. Guy is sitting in a chair and his finger starts to turn blue (or green) with a growth and then it starts to go up his arm and take over his whole body.
I thought it was The Thing or maybe The Swamp Thing but in checking so e you tubes those do t seem right. I was maybe 8 when I saw it.
Any ideas?
“Creepshow”(1982)
It was the segment titled The Lonesome Death of Jordy Verrill. It starred Stephen King and it was the 2nd story of 5 in this anthology.