What Can Be The Reason For The Hole Near The Anus?

I am 58 year-old female. Past history of 3 polyps found in colon during colonoscopy, about 7 years ago. Most recent colonoscopy 2 years ago, nothing was found. I also have a history of a fissure at 9 o'clock, which has not been a problem lately. I did have some blood in my stools about 1-2 weeks ago, and then I noticed this area at 5 o'clock that felt dry, like a healing sore. Tonight I finally looked at it with a mirror, and I have a little hole near my anus, about the size of a silver nitrate stick. I did not see a discharge of any sort. Any suggestions?