• Part B courtesy of Nasreen A. Syed, MD.
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    Ocular Pathology/Oncology

    Irritated seborrheic keratosis (also known as inverted follicular keratosis). A, Low-magnification photomicrograph shows a papillary epidermal proliferation with hyperkeratosis on the surface. Clinically, this lesion appeared as a cutaneous horn. B, High-magnification photomicrograph of a different lesion. The epidermis often shows whorls of cells, known as squamous “eddies” (arrows), and mild disorganization.