If the original cancer was smoking or other carcinogen suspected involvement, lesions, precancerous lesions can be anywhere in the aerodigestive tract, also can be a secondary, synchronous or metachrounous cancer, metstateses ot something minor. Ad mentioned, you are seeing an ENT for proper diagnosis, is The right thing to do. Hopefully it's someone thing minor, and there are many, maybe hundreds of medical conditions that can cause this symptom. Good luck.
