Hello! You should not be paranoid. Lymphoma can be cause, but I really doubt you’re your child has it. Sometimes children get swollen nodes from no reason and they pass without problems. Swollen nodes can be caused because of some infection: sore throat, cold, viral infection, bacterial infection, cold, rubella, tonsillitis, etc. I think that it would be best if you visit pediatrician. I am sure that doctor will tell you after tests what cause of swollen nodes on the neck are.
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