I had a faint red spot on the back wall of my bladder following my first 6 week round of BCG. When I asked my uro at that time he said it was from the BCG and that it would clear up on its own. When I went for another cysto three months later it was gone. If your uro has biopsied it then those results will tell you for sure if it is trouble or not. I’ve talked to others that have had redness on the bladder wall following BCG. BCG does cause inflammation but as with everything else, it will cause more for some people than others. Got my fingers crossed and saying prayers for a positive outcome for you.