Interesting. Why?
Isn't it a common and longstanding cultural practice, even among indigenous peoples? Intuitively, I'd say body modification is based on the desire to shape one's own body, something we usually embrace in fitness culture and medicine, for example.
I don't have any tattoos or scars, but I can't think of anything that would make them questionable.
Perhaps some of the objection arises from a confusion between body modification and self-harm?