discoloration vs eczema

discoloration

noun
  • A discolored spot; a stain. 

  • The act of discoloring, or the state of being discolored; alteration of hue or appearance. 

eczema

noun
  • Synonym of dermatitis 

  • Synonym of atopic dermatitis 

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