Adult onset of inflammatory linear verrucous epidermal nevus (ILVEN) is reported in a 44-year-old Japanese man. A mild pruritic eruption appeared one year earlier and extended from the left dorsal foot to the gluteal region. Histologically, acanthosis and papillomatous thickening of epidermis as well as spongiotic edema and exocytosis with lymphocytes and neutrophils were observed. Topical tacalcitol was not effective, but the pruritus as well as the eruption slightly improved with topical corticosteroid and vaseline containing salicylic acid. This adult onset of ILVEN is considered to be a rare case.

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A red nodule appeared on the left side of the scrotum of a 37-year-old Japanese man and slowly grew for four years. When he first visited us, it was 5 mm in diameter, polypoid shaped, and had a smooth and slightly moist surface. Histologically, acanthosis, parakeratosis, and dilated blood vessels were seen in the upper dermis. In higher magnification, the thick epidermis consisted of tumor cells with slightly enlarged nuclei and pale cytoplasm, and neutrophils were also seen among the tumor cells. The cytoplasm of the tumor cells was stained with periodic-acid-Schiff (PAS), and the positive reaction was digested by diastase. There has been no previous report of polypoid clear cell acanthoma in Japan, and only a few reports from the rest of the world. In addition, clear cell acanthoma arising on the scrotum is particularly unusual.

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