You have showed positive IgG antibodies
for TB. It does not signify a recent infection. You need to be evaluated further. Please get a chest x-ray done, sputum examination for the tubercle bacilli, a BACTEC test for TB. These are more specific tests.
The affected area in the neck may be biopsied and studied further to know the cause.
In my opinion, you should not neglect this, be quick, get back to your primary care
physician at the earliest, and get it treated accordingly.
I wish you healthy life.