The common causes of hard lumps on the inner thigh root in men are enlarged lymph nodes, hernia, lipoma, subcutaneous cysts, etc., which can be treated with medication or surgically removed. 1. enlarged lymph nodes: inguinal lymph nodes are enlarged when there can be hard lumps on the inner thigh root, commonly found in chronic lymphadenitis, tuberculous lymphadenitis, malignant lymphoma, etc. The drugs can be amoxicillin, cefradine, isoniazid, rifampicin, cyclophosphamide and so on. 2. Hernia: inguinal hernia can appear as hard lumps, which can be aggravated when coughing, bending and lifting weights, with the possibility of recovery when lying down, accompanied by inguinal pain, which need to be treated with surgery. 3. Lipoma, cysts: localized subcutaneous lipomas and subcutaneous cysts on the inner thigh root can also have hard lumps, which need to be surgically removed to be cured. It is recommended that patients go to the dermatology department in time to check the diagnosis under the guidance of the doctor, do not blindly use their own medication.