You needn't concerned about LGV; you don't have it. It is not a likely cause of a single small lymph node, especially in the neck. Equally important, the current dramatic rise in LGV cases (for the past 10-15 years) has been entirely in men having sex with other men, and in them it is limited almost entirely to rectal infection. There have been a few reports of single cases of oral/pharyngeal LGV, but the very fact of individual cases being reported in the medical literature reflects how rare it is. (Single case reports almost always have the main goal of alerting clinicians to rare and therefore easily missed conditions.) And LGV is not a subtle infection and almost by definition, never asymptomatic. Finally, the standard swab tests detect the LGV strains of chlamydia just as well as they diagnose standard, non-LGV types. So your negative test results prove you didn't have LGV when you were tested.

For all these reasons, you can be sure you do not have it; thThe LGV antibody test is diagnostically useless -- it misses most LGV infections and remains negative in many.

Don't worry at all about this!

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD

Yes, chlamydia and gonorrhea are the only STI tests routinely done in the throat. No others are needed:  I explained why above. 

Why do you doubt your ENT's advice?  I agree! The lymph node never was a legitimate concern for LGV or any other STD.

That concludes this thread. I hope the discussion has been helpful. Best wishes and stay safe.