callousing
cal-lous-ing
noun
The process of skin thickening and hardening, often due to repeated pressure.
"The callousing on her heel was quite noticeable."
verb
Becoming or causing skin to become thick and hard, typically from friction.
"His hands were callousing from constant heavy work."
Thesaurus
Synonyms: cauterize, callous, cauterise, toughened, thickened, calloused, tough, indurate, insensitive, pachydermatous