I used to work in a hospital and I found not very many people noticed or most were too polite to ask - I probably had about 5 questions total in the year I worked there. I was just honest about the fact I used to self-harm but that I'm fine now. With children I'd approach it a little differently; I would either say there are some personal questions you don't ask people as it can be rude, or I'd say I was ill and it left marks on my arms.
I hope that helps, try not to worry too much about it because you will find it to be less of an issue than you expect x
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