Hello,
My dog had the same problem... the only solution I found was to let her fur grow long enough so she couldn't lick or rub them as easily. Nothing else worked. She was an obstinate old lady... she wore the cone every night for 2 years so she couldn't lick them, then she got too old to bother... made an awful noise banging against the wall every night, but there was nothing else we could do. Good luck!