Perianal disease

Hi all, Our son has literally done every test possible (well the pill cam is next sooo not every test yet)…his diagnosis is “localized perianal Crohn’s disease”. They can’t find anything in his intestines etc. For those of you who have had this, did you find relief and/or remission with biologics? He’s had some surgeries for draining abscesses that ultimately were weirdly unsuccessful, forming fistulas. Honestly, at the Children’s Hospital, as wonderful as they may be, they only have general surgeons and I feel like we should see a surgeon specialized in this area…but can’t find any around here. We’re in the Bay Area, some of the best medical hospitals, where are they?!?!?