I've been playing bass for almost two years now and my fingers have never gotten calloused or blistered like you hear about from guitar players. Some rouge thread on TB said it's actually pretty rare to get rough fingertips because the strings are so thick on basses. Some part of me hoped that my bass playing prepared me for callous free guitar playing. [That was very wrong, and very stupid].
There are track marks left by Demon's strings, and peeling skin, which happen every time I pick him up. Also my fingertips seem to be huge, I have to kinda maneuver my finger pad and nail under the string next [to what I'm fretting] so there won't be unintentional muting.