We introduce SkinBot: a lightweight robot that moves over the skin's surface with a two-legged suction-based locomotion mechanism and captures a wide range of body parameters with an exchangeable multipurpose sensing module. We believe that robots that live on our skin, such as SkinBot, will enable a more systematic study of the human body and offer great opportunities to advance our knowledge in many areas such as telemedicine, human-computer interfaces, body care, and fashion.