Usually lymph nodes are sent to a pathologist, who examines the lymph node. Rather the pathologist looks at the lymph node for signs of infection or cancer. Sometimes a pathologist can surmise that a patient has HIV based on the way the lymph node appears. As for your concern at upsetting a doctor because you saw one vs. another, I can only say that it would be most unlikely that you will piss him off. I obviously can't guarantee this since I don't know your doctor.
Patients are often very concerned about seeking opinions.
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