u/funnyingredients

My gf and I got together around 6 months ago (been talking longer). she got a tattoo on her inner lower arm and I noticed some old looking sh scars when she sent me pictures of the tattoo. Back then I was abroad for a while so I didn't really want to talk about it from afar I guess but now I'm back. I didn't show any signs that I've noticed it. I also never had anyone in my close circle that sh. I don't really want to mention it if she doesn't want to talk about it but I also don't want her to think that I feel uncomfortable about the topic if she does.
Any advice on what to do?