<s>[INST] My son woke up this morning with a knot on the side of his neck. I have been looking at the symptoms for a lymph node infection but he doesn t seem to have any, except it hurts when you touch it. he is a very healthy child but it really is worrying me. I have an appointment this afternoon but i am so concerned, I cannot even work today. what could it be? [/INST] Hi, this could be a lymph node swelling, lymphadenopathy, lymphadenitis, cyst.it is usually seen that whenever there is infection in a child, the lymph nodes begin to enlarge which might feel as lymphadenopathy. In cases of lymphadenitis, fever is also present. It could also be a cyst, in case of cyst there will be blood like feeling, and it will be slightly mobile. However, for exact diagnosis an examination by doctor is a must. I advise you to meet the doctor for examination of swelling. I hope this will help you. Take care. </s>