exfoliation vs scurf

exfoliation

noun
  • The removal of a layer of dead skin, as in cosmetic preparation. 

  • The scaling off of a bone, a rock, or a mineral, etc.; the state of being exfoliated. 

  • The loss of leaves from a plant. 

scurf

noun
  • The flakes of skin that fall off as a result of a skin disease. 

  • Minute membranous scales on the surface of some leaves, as in the goosefoot. 

  • A grey bull trout (Salvelinus confluentus). 

  • The foul remains of anything adherent. 

  • A skin disease. 

  • Any crust-like formations on the skin, or in general. 

How often have the words exfoliation and scurf occurred in a corpus of books? (source: Google Ngram Viewer )