pockmark vs wheal

pockmark

noun
  • A mark or scar in the skin caused by a pock. 

  • A crater in the seafloor caused by erupting gas or liquid. 

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 pockmark and wheal occurred in a corpus of books? (source: Google Ngram Viewer )