Hello, I had a fistula and had a seton put it, it s been 5 months and next week I have a surgery to remove if and put a plug to heal the fistula opening, my problem is that for the last 3 days, the area where the fistula is has hardened, it feels like a lum in that area, there is also a slight pain, iam worried if it s an infection, it s Friday night and I can t get hold of my doctor till Monday, please help. Should I seek emergency care