my DP has this problem, it is re occuring as he refuses to have the surgery, he has them drained at times, most times as soon as he feels it swelling, he gets a script for ABs filled.

One thing he has been doing for awhile (since the last drainage, over xmas,about 3 years ago now, had to have it packed and re packed every day :/ until it healed, wasnt nice AT ALL!)
Is to wipe his bum with dettol after every BM. (and up the crack) he hasnt had it swell up since.

are they doing the whole skin graft thing?