Hi Sam :)
This link shows pics of hemmies first, and under them it shows pics of perianal crohns skin tags (aka; elephant ears)...what does your resemble (If either)?
Hemmies are from the anus as are perianal crohns skin tags but sometimes the tags can be further away from the anus...you could also be experiancing an abcess, which unfortunatly is also directly related to crohns.
My bum is broken....there's a big crack down the middle of it! LOL :)