Small knot on thyroid pain to touch

Has anyone else experienced a knot on the thyroid with pain to touch? I've visited my doctor for an exam and the response was much of the same "nothing to worry about. It's all art of the healing process." I worry with the slightest change constantly wonder what's next. Any suggestions or comments?
I have had radiation after after surgery to remove a large tumor on my tongue. 57 nodes removed no matastasis. I am one year post surgery.
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