Accentuated varicella exanthems due to cast application.

We report a case of 14-year-old male with local augmentation of varicella zoster exanthems on the forearm on which cast application was performed. After 1 week, the first varicella zoster exanthems began to appear on the left forearm under the cast and trunk, while lesions on the other forearm and extremities were very rare. We postulated that the local pressure and heat increased the number of exanthems.