Varicella is a common childhood disease with a typical exanthem. We pr
esent four children with severe, localized disease, all associated wit
h some form of trauma to the skin during the incubation period: a 3 1/
2-year-old boy sustained wasp stings on the hand, a 5-year-old boy rec
eived extensive sun exposure, a neonate had iatrogenic trauma to her a
rm, and a 13-year-old boy underwent knee arthroscopy and was wearing a
cast. It is postulated that such injuries to the skin either allowed
more virus-infected cells to enter the skin at the sites, or that fact
ors such as insect venom and ultraviolet light altered local immunity
to varicella zoster virus.