Hi.
The bleeding may be part of the healing process after surgery. However, if it is extensive it may risk forming obstructions. Obstructions may not only be painful but may impair kidney function if protracted. I agree that it should be evaluated by his doctor straightaway.
Stay positive and discuss your concerns with the doctor.
My husband also had the surgery, and one of the things that was told to us by his MD, is if you see Blood clots or have alot of pain call the office. Call his MD. and explain what's happening. I don't know if your father had the robotic surgery or open. I don't think it makes a difference. but having clots may not be normal.
myw27