I experienced something similar and after having it analyzed by my GI doc, dermatologist and a colorectal surgeon, they all concluded it was a skin tag and to do nothing about it. Like you, I noticed it suddenly one day, while showering. I don't know when it appeared but it was like one day I felt it and I never noticed it before. It didn't hurt but I felt a pea sized bump.

Have your GI examine you and get his or her opinion on it. Good luck and I am hoping it's a skin tag as with me. I hear they are common.

Thank you @CTBarrister, much appreciated. I'm going to get it checked out. Always nice to hear it's not entirely uncommon. Thank you again.

Another possibility is a small hemorrhoid - at least that’s what my pea-sized bump was diagnosed as. In either case the likely advice will be to try to ignore it. A hemorrhoid like that will often disappear over time, but I don’t think skin tags usually go away on their own.

You would like to think it's a skin tag or a small hemorrhoid, but my first thought when I felt it was that it was the beginning of a cancerous tumor that had started at the rectal cuff.  I thought that because number 1 I am a cancer survivor, and number 2 because I was told long ago that although pouch cancers are very rare, they almost always start with the rectal cuff because that is the only remaining colonic tissue after J Pouch surgery. Plus I had also had pre-surgical dysplasia in my colon. So my reaction, like Lou's, was to freak out.

The overwhelming likelihood is that it's something Lou will be advised to ignore, but he should have it checked out just to make sure.

It could be a hemorrhoid, acne bump, or it could be a skin tag; I would recommend getting checked out by a gastro ASAP, only he would know for sure. I know it stinks having to get checked out by a doctor but its better to be safe than sorry for sure. I would call the office tomorrow and make an appointment.  

Lou, what did you find out?  I have had bumps around my rectum, some right on the rectum.  They end up being cysts for me.  Very painful when inflamed.

I have the same thing.  My GI says it's a "skin bridge".  She said it's the way things have healed even though I've had my pouch for 20 years.  I have her check it each year. She said it can be cut off by a surgeon if it really bothers me.  I freaked out when I found it too.  Of course your mind goes to the worst thing especially with what we've been through.