[Zosteriform pigmented purpura of Schamberg: case report and differential diagnosis of zosteriform skin lesions].

A 13-year-old boy presented with progressive pigmented purpura of Schamberg in an unusual zosteriform distribution. He recently has taken methylphenidate which has not been described as a cause of Schamberg disease. Many different skin diseases can present in a zosteriform distribution. They are reviewed systematically and sorted by pathogenetic criteria.