Diagnosis question

Hi,about a month ago, I had a lymph node on my neck and when I went to visit my physician, he told me that no need to worry but I should come back to check if some of the symptoms, such as the node increases in size,fever, weight loss, or night sweat, occur. Now, the node on my neck disappears but I still worry if it is a kind lymphoma or not. So if I want to take some lab examinations to make sure for my case, can you recommend me what kinds of tests that I should request?
Thank you very much

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