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Fully-developed verrucae vulgares and digitated solar keratoses are both examples of a hyperkeratotic, verrucous, epidermal proliferation, but telling differences exist between them. Solar keratoses are very superfiscal squamous-cell carcinomas of one type, they “sparing” epithelial structures in the epidermis, i.e., eccrine ducts (acrosyringia), and infundibular epidermis (acrotrichia). The abnormal epidermal keratocytes of solar keratoses mature […]