Lymphofluoroscopy (emerging imaging technique in the field of lymphology) is now used since 3 years by the promoters of this study to visualize the architecture of the superficial lymphatic network and the progression of the lymph inside the highlighted vessels. This technique will be used in the present (prospective and multicentric) study to observe the effect of a pressure applied on the lower limb on the displacement of the lymph, and then to determine the occlusion pressure of the lymphatic vessels. The investigators already studied the occlusion pressure of the superficial lymphatic vessels of the upper limb in a previous study. The investigators would like to complete our results with the lower limb.