Ob-Gyn questions? Ask a gynecologist online.
Hi and welcome.
Spotting can be symptom of number of conditions including infection, stone, as well as cancer. Since you had a history of bladder carcinoma you can not ignore this. I would suggest you to follow up with your doctor for thorough examination and cystoscopy to be on safe side.
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Wish you good health.
Let me know if you have further questions.