An enlarging, conical "cutaneous horn" that has been present for more than a year projects 0.5 cm from a 0.7-cm base on the left lateral cheek of the face of a 58-year-old farmer. This lesion is excised, and microscopic 'examination shows basal cell hyperplasia. Some of the basal cells show nuclear atypicalities. This is associated with marked hyper keratosis and parakeratosis. Which of the following lesions best accounts for these findings?