There are two options that are available, one is surgical and non surgical, in non surgical there is something called laser procedure to treat fistula in ano, but with any procedure recurrence rate can vary from 0-18%, and it cannot be predicted. What is important is to find the primary cause behind the fistula in ano, if that is taken care of then the risk of recurrence can be reduced.
Next Steps
Consult a good general surgeon, because the choice of procedure depends on the underlying problem and the depth of the fistula.