He could fee the spot with his finger, but couldn't see it with the scope? That's weird. I've heard of people having ulcers in their pouch before. I wonder if that's what it is. But that's the kind of thing you'd think he'd be able to see on the scope.
Do you have a rectal cuff? A rectal cuff is a small amount of original rectal tissue from the colon, that some surgeons, sometimes leave at the anal opening, to attach the pouch to. I think the amount of tissue that's left can vary, depending on the preferences of each surgeon. I think I've heard of people having as much as one inch of rectal tissue left. (I'm not sure how much that is in centimetres, but it's a lot.)
A lot of people have problems with their rectal cuff and it gets inflamed all the time. It's still part of your colon, so technically, it still has the colitis.
But I'm not sure if most surgeons still leave a rectal cuff, nowadays. My surgeon said I only have like, one milimeter of original rectal tissue left in that area. But when I told other people about that on this site, they were surprised, because they didn't know that's possible.
I got my surgery done by Adrian Greenstein at the Mount Sinai Hospital in New York City in 2012. Based on some things I've seen on this site, I wonder if he did certain things differently than other surgeons because my scars look a lot different than other people's that I've seen pictures of and he said he didn't leave a rectal cuff. And as I said, other people don't seem to be aware that that's possible.
Ask your surgeon if he left a rectal cuff, and if so, how big is it?