I've got a catepillar on my middle finger from the paint brush I use for work...looks bad but doesn't hurt. Just one of those things you get when you do alot of the same. I'm sure Knot's had/has a few of his own from his line of work too.
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do it right, do it yourself. If that doesn't work, prepare to pay for your mistakes.
I've got a bit of a callus on my right index finger on the side facing out towards the thump on the joint at the end. Not too bad, but my right pinkie is even worse, it's either blue or black all the time.