A 20 year old man injures his right leg in a skiing accident. A Radiograph of leg revels a compund fracture of the right fibula. The leg is immoblized in a cast. Wehn the cast is removed, the pateint notices that acallus has appeared where the cast rubbed agaiinst his foot. Which of the following terms best describes the mechanisms of allus formation in the skin of this patient?

Metaplasia

Hyperplasia

Dysplasia

Hypoplasia

Atrophy