blain vs wheal

blain

noun
  • A skin swelling or sore; a blister; a blotch. 

wheal

noun
  • A small raised swelling on the skin, often itchy, caused by a blow from a whip or an insect bite etc. 

  • A mine. 

verb
  • Synonym of wale. 

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