Imperfections in Character Models?

Hello,

New to character animation here.

How do you implement imperfections into a character model for animation properly? So that the deformation doesn’t go bonkers while animating?

Example: Putting finger prints on a character to make them look like they are made out of clay.

Example: Minor defects in the skin.

I’ve seen mDotStrange do it on a lot of his characters in his feature 3D animations?

Should I use a map, model it into the character, etc. ?

Any help is appreciated or if you could even point me to an article that would help. I’m trying to learn about the proper workflow of a 3D animation anyways.