Did you know your body has an inbuilt sewerage system? It's called the lymphatic system, and it is a crucial part of how your body fights infection and disease. Lately, the lymphatic system is causing a stir online, with some social media personalities promoting " lymphatic drainage " for beauty and skin health. So what is lymphatic drainage? And is it backed by science? The lymphatic system is a network of tiny vessels that, like your blood vessels, branch out to most tissues in the human body.