Sacral (S1) herpes zoster.

Herpes zoster usually affects the thoracic and lumbar vertebra (T3-L3), while sacral herpes zoster has been very rarely reported. We present a very rare case of herpes zoster involving S1 dermatome in a 35-year-old healthy man who presented aching pain and typical herpes zoster eruption on the lateral aspect of the calcaneus, lateral plantar area and dorsal aspect of digits III and IV.