itch vs scabies

itch

noun
  • A sensation felt on an area of the skin that causes a person or animal to want to scratch said area. 

  • A constant teasing desire or want. 

verb
  • To scratch or rub so as to relieve an itch. 

  • To feel itchy; to feel a need to be scratched. 

  • To cause to feel an itch. 

  • To have a constant, teasing urge; to feel strongly motivated; to want or desire something. 

scabies

noun
  • An infestation of parasitic mites, Sarcoptes scabiei, causing intense itching caused by the mites burrowing into the skin of humans and other animals. It is easily transmissible from human to human; secondary skin infection may occur. 

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