A Case of Post-zoster Eosinophilic Dermatosis.

Post-zoster eosinophilic dermatosis is a rare disease that occurs as an isotopic response in the region of previously healed herpes zoster. We report here on a case of post-zoster eosinophilic dermatosis that occurred 13 years after an episode of herpes zoster. A 48-year-old woman presented with several pruritic, brown papules and plaques in the same dermatome where her previous episode of herpes zoster had healed. Histopathologically, there was a dermal inflammatory cell infiltration composed of abundant eosinophils, lymphocytes and histiocytes. Based on these clinicopathologic findings, the patient was diagnosed with post-zoster eosinophilic dermatosis.