[3d Congress of the German Dermatological Society 1891 in Leipzig]

The course and subject matter of the 3rd congress of the German Dermatological Society held in Leipzig 100 years ago, are described. The main topics were tuberculosis, eczema, theory of psorospermoses and venereology, and these, together with the clinical presentations, reflect the level of research at that time and the charisma of the personalities in dermatology. Some of the subjects discussed are still topical and are still providing the stimulus for future research activity.