Hello, I am having swollen lymph nodes under left ear.Last year had the severe swelling as I traveled out of station and had water contaminated water.we took TB test lymphoma test by taking a piece of tissue from the swelled part in neck but the results were negative..so my doctor gave antibiotic and got cured.Same one year later now getting little minute swelling not visible outside .feeling light pain may be I am always thinking of that.only in the neck no other areas.is it becoz of ear infection or tooth infection.not sure.what should I do now.pls suggest.