An 11-month-old boy presented with Gianotti-Crosti syndrome. He had received measles and a third dose of hepatitis B vaccines 2 weeks before the onset of the eruption. There were no clinical symptoms of any viral infection at the presentation. Serological tests for common viral infections were negative. The combination of measles and hepatitis B vaccines was likely the relevant factor in the etiology. Copyright (C) 2002 S. Karger AG, Basel.