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The lymphatic system transports fluids such as leaked protein from the extravascular compartment of the dermis. Small capillaries arise in the extracellular tissue spaces and form larger channels, which drain to the regional lymph nodes, and then via intermediate nodes before eventually returning to the thoracic duct. Any midline structure has bilateral lymphatic drainage. Therefore, the lymphatic drainage of either labium majus or minus is to both the ipsilateral and contralateral superficial lymph nodes [27].

The superficial regional lymph nodes of the perineum are found in two groups at the base of the femoral triangle. They communicate freely with one another and drain the whole of the perineum, including the lower thirds of the urethra, vagina, and anal canal.

These subsequently drain to deep nodes in the pelvis and ultimately to para‐aortic nodes on the posterior abdominal wall.

A variable number of lymph nodes lie transversely in the superficial fascia of the thigh, immediately below the medial two‐thirds of the inguinal ligament. The superficial femoral or subinguinal lymph nodes lie on both the medial and lateral aspects of the long saphenous vein. There are between 3 and 20 of these, and the lateral nodes send efferent lymphatics to the external iliac deep lymph nodes.