I am so sorry! Having an infection just makes the whole process so much more difficult. I would suggest you keep in close contact with your doctor's office and let them know how you are feeling and what your skin looks like.
How long was your treatment time? If you are nearing the end of the prescribed time, you may be at the erosion phase and essentially done. Your doctor can tell you for sure. I am including a couple of articles about the erosion phase. They may come in handy in the coming days.
https://skincancer.net/life-with-skin-cancer/efudex-cream-how-long
https://skincancer.net/life-with-skin-cancer/efudex-erosion-stage
Best of luck! Sending you gentle hugs for healing.
April, SkinCancer.net, Moderator