A case of seborrheic verruca with characteristic changes of the so-called intraepidermal basal cell epithelioma of Jadassohn is presented. Within three days following irritation caused by the trauma of a surgical biopsy, this lesion "matured" showing histological changes suggestive of squamous cell carcinoma. This lesion presented in different areas histological pictures characteristic of typical seborrheic verruca, intraepidermal basal cell epithelioma of Jadassohn, and basosquamous cell epidermal tumor of Lund, suggesting that these changes represent variations of one tumor, namely, seborrheic verruca.
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A. Morales (1965) studied this question.
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