Lymph can be said to be ubiquitous in the human body, and the lymphatic system is usually accompanied by the arterial and venous systems. So it can be understood that wherever there are arteries and veins, there is lymph. Usually what we call lymph is superficial lymph nodes, and the areas that are rich in superficial lymph nodes are pre-auricular, post-auricular, submandibular, mandibular, neck, supraclavicular, infraclavicular, and infra-axillary lymph nodes, as well as the inguinal area, which are the areas that are rich in lymph nodes. Therefore, when lesions occur, the lymph nodes in these areas are prone to enlargement and are easily palpable.