Mantoux test advised for my 3 yr son having swelling around his neck.Does swelli!

Mantoux test advised for my 3 yr son having swelling around his neck.Does swelling only indicate TB infection?

I found swelling around his neck of my 3 yr son(around 12.5 Kg) three days back. I took him to Doctor as he was suferring from cold next day. Doctor advised Mantoux Test(I know this test for TB). Does swelling around neck indicate only TB infection or it may indicate any other thing. BCG vaccination already done for my child. I am worried for Tuber culosis infection. I take lot of health care for him. In the past he suferred from fever twice/thrice a year.Nobody in my family had TB infection. Please advise.

It is highly unlikely your son has TB. I really would not be worried about that if the only symptom was lymph gland swelling. You said he had a cold the next day. Was he coughing or bringing up anything? Could a cough have concerned the doctor to order a TB test?
Have you considered simple things like mono, influenza, sore throat, even tooth problems. Lymph swelling that is assymetric on both sides and does not go away might make you worry about more serious problems.Many things can cause a swollen neck. In my scope of thinking, TB would be far down the list unless the doctor was concerned about another symptom that he saw.