<s>[INST] My 19 month old son has a limpoma in the back of his neck thats small and moves when I touch it. I went to his well care pedestrian an she told me that its something that fights off bad bacteria and that my son will outgrow it. Im very afraid that she wasnt being completely honest. [/INST] Hello, Welcome to ChatDoctorI understand your concern. Your son is most probably having enlarges lymph nodes. Lymph nodes are normally present in our body. They are abundantly distributed in the neck region. The doctor you have consulted has told correctly. These help our body to fight against bacteria and viruses. Whenever body faces some type of infection, these will get enlarged and become palpable. So, no need to worry. If your son had upper respiratory tract infection or tonsillitis in the recent past, it might have got enlarged. Hope you are happy with the answer. Thank you </s>