I know I know, cats do this all the time. But I was wondering how normal this is.. when he sits on my lap he's gottah rub his head on each side of the chair like alot.. usualy its on the left arm and the right arm.. almost like they are head scratchers. He'll do it for like 5 or 10 mins or so unless I slip my hand in there and rub it. When I'm at the computer desk he does it to the point where it gets to scare me because it's a hard cornered desk and he'll just rub and scratch like crazy on it. It's always the top of his head.
His fur is clean and his skin is clean so i'm sure there's no fleas or ringworm or anything. Just curious if anybody else's cat does this.