Patients with swollen lymph nodes at the root of the thigh can clinically consult different departments depending on the specific cause of the swollen lymph nodes. First, if the patient has hemolytic streptococcus caused by lower extremity dengue, the lymph nodes are swollen due to the invasion of superficial lymphatic vessels to the root of the thigh. In this case, the patient can consult the general surgery department, which can strengthen the anti-infection treatment by local topical application of 50% magnesium sulfate to reduce the painful symptoms of swollen lymph nodes. Second, if the lymph nodes at the root of the thigh are swollen due to varicose veins in the lower extremities, the patient can consult the vascular surgery department and perform surgery to completely remove the varicose vessels, which can reduce the symptoms of swollen lymph nodes. If the lymph nodes at the root of the thigh are swollen due to tumor lesions, patients need to consult orthopedic surgery to have the tumor lesions removed as soon as possible by perfecting relevant examinations, and some patients can achieve better treatment results.