A 27-year-old woman has developed areas of scaling skin over the past month. On physical examination, there are 1- to 3-cm light pink plaques covered with the silvery scale on her arms and torso. A punch biopsy of one lesion examined microscopically shows keratinocyte nuclei retained within cells in the stratum corneum. Which of the following descriptive terms best applies to this microscopic finding?
Acanthosis Dyskeratosis Hyperkeratosis Parakeratosis