Zosteriform persistent acantholytic dermatosis and porphyria cutanea tarda

Our case refers to a 77 year-old man with a history of porphyria cutanea tarda (PCT) who presented with pruritic eruption consisting of erythematous papules localized in a zosteriform area on the right part of the trunk which had appeared three years previously. He gave a history of long exposure to the sun. A biopsy showed a spongiotic pattern, dyskeratotic acantholytic cells and corp ronds in the granular layer. Diagnosis of persistent acantholytic dermatosis (Grover's disease) was made. To the best of our knowledge no case of association of PCT and persistent Grover's disease has been previously described in the dermatologic literature.