facial mask vs masking

facial mask

noun
  • An application of mud, clay, etc. to the skin of the face for cosmetic purposes. 

masking

noun
  • The practice of wearing safety masks, such as face masks. 

  • The act by which something is masked; the act of masking, of concealing or disguising. 

  • An entertainment at which the guests conceal their faces with masks. 

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