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An lump on the thyroid should be assessed via an urgent pathway, this is why your doctor has done this. This is fundamentally to exclude serious causes however most are benign but need further investigation first.
That is reassuring, but it should still be investigated.
I suspect an ultrasound, as a nasendoscopy (camera through the nose) can only tell you about some of your nose and throat.
They may suggest a fine need biopsy at some point if not sure of the cause. Or repeat the Ultrasound scan to monitor it.