Hi i had an op in November to remove a fistula and obstruction.I had one wound left open ,but the other was closed with staples.After 2 weeks 2 1/2 inches of the wound opened.This was due to an infection.I am still having the nurses in every other day to dress the wounds and still have a small amount of extradate leaking out.They have told me this is good as you don't want any infection building up inside,it's better out than in. I would get it checked out ,as you may only need a course of antibiotics.
Good luck and i hope you carry on recovering well.