The swelling of the male private part connected to the root of the thigh may be sebaceous cysts, enlarged lymph nodes and femoral hernia, etc. It is recommended to go to the hospital for further examination to make a clear diagnosis. 1. Sebaceous cysts: As hair follicles and sebaceous glands are widely distributed in the perineum, sebaceous cysts may be caused by excessive sebaceous gland secretion or sebaceous cystic duct blockage if personal hygiene is not taken care of. 2. Enlarged lymph nodes: If there is testicular inflammation, perianal abscess and other infectious diseases, it may lead to inguinal lymph node enlargement. 3. Femoral hernia: Increased intra-abdominal pressure due to constipation, difficulty in urination and forceful sneezing may lead to femoral hernia, resulting in the appearance of inguinal swelling.