Yes. They're a definite "identifier" when you're on the run, using aliases.
When you go into prison your first time and they're booking you, taking your picture, etc and asking you about your tattoos, scars, etc. . They're not "interested" in your shit ..
They're marking on a graph of your body every single mark on your body and where it is exactly. If they can't see it, don't mention it. The more unique, the more you can't deny that's you. Just saying.