vellicate in WordNet English dictionary

1. irritate as if by a nip, pinch, or tear
   "smooth surfaces can vellicate the teeth"; "the pain is as if sharp points pinch your back"
   pinch  vellicate 
   
2. touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements
   tickle  titillate  vellicate