I saw my friends self harm scars, what do I do?

I saw my friends scars about two weeks ago and I don't know what to do. In case you're wondering what I'm talking about, I saw her self harm scars. Some seemed pretty recent so I think that she still cuts herself sometimes. I'm an EDNOS myself so I think that I would understand her IF we talked about it. So my question is what do I do? Do I tell her that I saw them and it's okay and she can talk to me or what do I do?

If someone who's been depressed or cut themselves can answe that would be great but if you don't and want to answer then go ahead!
I saw my friends self harm scars, what do I do?
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