okay I slap and pop a lot, and my middle finger (finger I use to pop strings) has a very huge callous on the tip of it. Am I using an improper technique? am I supposed to have a callous? it gets painful after long usage. should I rip it off? or is having a callous a playing advantage and just unsightly to the eye? thanks. also do any other players here have callouses? and are they something one should have or no?