get to vs get under someone's skin

get to

verb
  • To intimidate. 

  • To be allowed to. 

  • To reach or arrive at (a physical or abstract destination, or state of doing a certain activity). 

  • To affect adversely; to upset or annoy. 

  • To go to or be located at (a particular place). 

get under someone's skin

verb
  • To irritate someone. 

  • To make a memorable impression or have a strong effect on someone; to impact someone's feelings, especially when such an effect is not expected or wanted. 

How often have the words get to and get under someone's skin occurred in a corpus of books? (source: Google Ngram Viewer )