lily-white vs melanin-challenged

lily-white

adj
  • Of the Caucasian race; white. 

  • Pure, unblemished, immaculate. 

  • A shade of the color white. 

  • Innocent, having a reputation beyond reproach. 

melanin-challenged

adj
  • white; having white skin or belonging to the white culture; not black 

How often have the words lily-white and melanin-challenged occurred in a corpus of books? (source: Google Ngram Viewer )