Blisters can be caused by this resistance to motion between surfaces, from the Latin for "to rub"
[DOC] [TLE] Friction - definition of friction by The Free Dictionary [PAR] [C16: from French, from Latin fricti a rubbing, from fricre to rub, rub down; 
related to Latin frire to crumble] ... 1. surface resistance to relative motion, as of a 
body sliding or rolling.