The size of the lymph nodes varies and ranges from about 2mm to 1cm. Routinely, lymph nodes are relatively small and cannot be touched. However, if the subcutaneous fat is thin, the lymph nodes can also be touched, such as the lymph nodes behind the ear, which can be touched under normal circumstances. The lymph nodes in the groin area are relatively large, some 0.5 cm, some 1 cm or so. Usually, they can be touched when lying down. If the surface of the lymph nodes are red, swollen, painful and swollen, consider the inflammatory infection caused by the routine oral antibiotic treatment can be, such as cefixime. Usually the pain can be relieved after about 10 days of treatment. If there is painless lymph node enlargement, such as unintentionally finding enlarged lymph nodes on the body surface, relatively large, even two centimeters and three centimeters. But there is no pain when pressing on the lymph nodes, consider that it may be caused by tumor metastasis. At this time, you should go to the hospital for examination to find the primary lesion of the tumor, and if necessary, remove the lymph nodes and send them for pathological examination.