I'm so sorry that you are having this issue. I have not heard of anyone getting blisters in their bladder.
One thing that seems to soothe my bladder after my BCG treatments is warm green tea.
I buy the powdered green Matcha tea (mix it with hot water) and drink a few cups every day. I've had only 9 BCG treatments, so the inside of my bladder still looks good.
I hope this helps
Dx 5/28/15 with 4.2cm x 2.2cm Ta HG Papillary TCC; 2nd TURBT 7/09/15, NED; 6 BCG completed 9/30/15; 3 sets of BCG maintenance completed 1/26/17. Six cystoscopes - all NED. Moving to scopes every 6 months, and no more BCG maintenance.
Has anyone suffered chronic inflammation after a series of BCG treatment? I am grateful that my last biopsy was clear, but have developed cystitis after all the treatments. My biopsy also showed chronic inflammation of the bladder that looks like blisters in the bladder. There does not seem like much on the topic of blisters in the bladder after a series of BCG treatments. I was given antibiotics during the biopsy/cystoscopy and that was it. I am doing some research for natural products to help heal the bladder. I am not convinced that continued antibiotics is the long term way to go.