complexion vs skin colour

complexion

verb
  • To give a colour to. 

noun
  • Outlook, attitude, or point of view. 

  • The quality, colour, or appearance of the skin on the face. 

  • An arrangement. 

  • The outward appearance of something. 

skin colour

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