I have anal skin tags (perianal crohn's skin tags, aka; elephant ears) and mine are huge, it's actually where my CD started and then it attacked me internally, usually CD starts in the TI but not mine, however it did end up there too.
Here's a link that shows pics of hemmies (which is what my skin tags were misdiagnosed as) and then the set of pics below the hemmies are the skin tags. Some CDers get hemmies too so it's a good idea to use a mirror and see which yours resembles more (in comparison to the pics in the followin link)...
Either way, if this is a new issue for you, you should have you doc check them out.
My bum is broken....there's a big crack down the middle of it! LOL :)