There is no easy way to discuss self-harm. No matter how you go about bringing forward difficult struggles from your past, it is almost always going to be an uncomfortable situation. Even for the most confident person, there is always something that gets in the way of that confidence and, for some, it can be discussing a mental health issue, like self-injury, they deal with.
When looking at some people, you cannot notice that they once struggled with self-injurious behaviors either because they made marks that did not scar or marked areas are unseen. However, some scars can be very difficult to hide no matter how much make-up and jewelry you use. For those who have a few visible scars here and there, people may see the marks and question them, not connecting the dots.