Welcome in H.C.M.
I have gone through your query regarding small tubercular node in neck which had now became larger in size and diagnosed as cold abscess
. Though you are already taking anti tubercular treatment.
In reference to above matter I would like to tell you that some times this type of situation comes in treatment course because of emergence of mutants which are resistant to primary line of treatment. So please consult your doctor certainly he will switch over your treatment on to secondary line of treatment.