Husband has swollen lymph node on left side neck. You can feel and see it. Recent flu diagnosis and eye staph. Doc ordered chest xray. What is it?

Likely inflammatory . This is likely a inflammatory lymph node related to his recent illness. This should be checked out by your md. If multiple lymph nodes they may want to do a ultrasound or ct to look at lymph nodes. Less likely a biopsy could be preformed.
NECK LYMPH NODES. You must wait for the result of the x-rays. It could be due to an infection from the flu, but the x-rays may be able to make the diagnosis.

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