In this study, the investigators will suspend ICG in 25 ml pure water and subsequently diluted with pure water to reach a final concentration of 0.2 mg/ml. Each subject will receive an intradermal injection of 0.5 ml of diluted ICG (e.i. 100µg), using a hypodermic needle. The investigators will standardize the injection point and inject ICG intradermally in the first interdigital space, according to the injection method used for lymphoscintigraphy. In this way, the investigators highlight systematically the same area of the superficial lymphatic network.