A hard bump on the inner thigh root is considered to be a possible boil or enlarged lymph node. Boils are caused by bacterial infection and are mainly associated with redness, swelling, heat and pain. For treatment, topical fusidic acid cream or ichthyolite ointment can be given, and surgical incision and drainage can be performed when fluctuations occur. Lymph nodes with good activity are considered to be related to local inflammation, such as genitourinary system diseases, or sexually transmitted diseases, such as syphilis and gonorrhea. After active treatment of the infection, the lymph nodes will return to normal. If the mobility is bad with adhesions, malignant tumor or lymph node metastasis caused by malignant tumor needs to be excluded. At this time, color ultrasonography and, if necessary, pathological biopsy should be performed to clarify the diagnosis.