Posted 12/4/2016 12:54 PM (GMT -7)
I would think the pain is not unusual because a month really isn't that long and it's probably still healing internally. The nerves can have a bit of damaged from the abscess itself, the incision, and the compression from being packed, which may take a longer time to resolve. I still have pain from a small abscess (non-Crohn's related) I had during the summer even though it's been months since it healed. If your pain were to get worse, that would be reason to have it checked out.
I don't know about others with fistulas, but my experience was that I didn't feel any particular pain from them, but mine also didn't involve an abscess. Mine weren't connected to the epidermis, so that may make a difference as well.