A 59-year-old man presented with pruritic erythematous to violaceous patches on the whole body that had first appeared 1 week previously. Mucosa was intact and he had no other medical problem including herpes simplex virus (HSV) infection and had not taken any medication for several months. Physical examination revealed typical target lesions, which were symmetrically distributed over the entire body (Fig. 1). Histopathologic findings demonstrated interface dermatitis with dyskeratosis (Fig. 2). With the typical clinical and histopathologic features, erythema multiforme (EM) minor was diagnosed. Painful erythematous grouped vesicles appeared 4 days later on the right T9 and T10 dermatomes (Fig. 3). The serologic test showed positive for varicella-zoster virus (VZV) IgM and IgG which confirm the diagnosis of herpes zoster (HZ). We prescribed intravenous acyclovir in addition to systemic steroid for erythema multiforme, which improved the skin lesion.
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