Postinfectious purpura fulminans secondary to varicella-induced protein S deficiency.

Varicella is usually a benign and self-limited disease of infancy and childhood although it has been recognized that it sometimes has severe and life-threatening complications. We report a case of postinfectious purpura fulminans with acquired protein S deficiency following varicella in a 6-year-old child and discuss the underlying mechanism of postinfectious purpura fulminans.