 He was also the first to publish a detailed study ("Über die senilen Veränderungen der Haut des Menschen") of prematurely aged skin caused by over-exposure to weather conditions.However it wasn't until several years later that Paul Gerson Unna (1850-1929) gave it a name, calling it "seemannshaut" or "sailors' skin".During the Austrian government's occupation of Bosnia-Herzegovina, Neumann was sent to the country to manage the public health problem of syphilis and leprosy.