DS asked me about my self harm scars

[Mysteriously]

I self harmed in my teens and it's left me with scars on my legs. DS who's 5 asked me about them today, he recently cut his head and he's now got a scar there so he we were talking about it and he pointed out that I've got scars too and then asked me how I got mine, I told him I got hurt but he wasn't happy with that answering and wanted to know what happened, I just told not to worry about it and it doesn't matter. It's bothered more than I would have thought, I've always been a bit embarrassed about them and I don't like having to see them myself nevermind over people. It bothers me that one day he'll probably understand what they are

I understand as my 6yo DD has recently been asking me about my self harm scars which are very extensive over my arms and legs. She asked me several times at the start of the summer and as a result I’ve been covering up with long sleeves and leggings etc even through the heat. I hate hiding myself from my daughter but I don’t know how to explain this to her. I told her that they’re scars from when I was poorly and hurt myself but it wasn’t enough and she wanted to know how exactly I’d hurt myself. I was able to divert the question but I’m terrified that it’s sure to come up again in the future and I don’t really know how to tell her I did it myself.