The presentation is as follows: Parents unintentionally found a small number of lumps in the neck, behind the ear, or in the occipital area, the size of a soybean to a fava bean, no obvious discomfort, no pressure pain, and the lumps are movable. The answers are as follows: (a) These masses are lymph nodes. (b) Lymph nodes are important immune organs of the body, capable of engulfing bacteria, stopping the spread of infection, and often enlarging themselves in the process of fighting infection. They are fixed in place, they are just palpable when they are large and difficult to feel when they are small. (iii) Most of these children attending the clinic belong to: 1, chronic lymphadenitis, mostly due to previous upper respiratory tract infections, local skin inflammation, eustachian inflammation, bad teeth, etc. These diseases are often untreated at the time of consultation, or there are no obvious diseases mentioned above at the time of consultation, but there is a previous history of the above diseases. 2, normal lymph nodes, which can be large in infants and young children because the lymphatic system is not well developed. (d) If the above diseases are present, treatment of the primary disease is the main concern. If there are no such diseases or there were such diseases but they have been cured, they can be observed (for several years) and generally do not need to take antibiotics and other treatments. (e) If: the enlargement is rapid, with pressure pain and local skin redness (acute lymphadenitis); there are symptoms such as wasting, low fever and night sweating (lymph node tuberculosis); the number is large, the site is extensive, there is wasting, low fever, etc. (lymphoma and other tumors may be), that is, you should go to the hospital for further examination.