Husband had bladder and prostate cancer 2004. Had bladder and prostate removed. His urostomy pouch will become purple after 2-3 days of wear. I change pouch when it becomes discolored, and change complete system every 5-6 days. Stoma is nice pink color and he has no other problems except for odor and mucus which I am told is common. I just wonder about the change of color for the pouch and also the night drainage tube become purple after about 2-3 week use. Any thoughts on this?