How do I ask someone else if they SI?

[Avalon]

As a long time cutter I am very sensitive about my scars and don't like it when people comment on them or make it known that they are curious. I don't like the questions and I don't like the looks.
So how do I approach someone else who I think is a cutter without offending them in the same way I would be. I am not worried about them but I have a certain sense of curiosity about their scars. I think they are a cutter but it's not definitive because they have only a handful, but they look like SI scars.
I was thinking to ask "so how many porcupines did YOU tangle with?" To gauge their reaction, but of course, as a cutter myself I also don't want to put them under any undue stress or awkwardness, especially as this is a new room mate.
Any ideas or advice would be welcome

[Horizon]

I think if you don't know them very well, I wouldn't bring it up at all. If you are not worried about them, there's really not a reason to put them on the spot, so to speak, by asking questions about their scars. If it's just curiosity, I would leave it alone.

[ajrocks]

hmmm I think that's a tough one I think if it was me I wouldn't say a word not unless they bought it up.
It could well be theirs another story behind it,my friend has very convincing looking scars all up her arms but she actually has a bad skin problem that's all and is paranoid about it-your friend might be paranoid about it too so if you said anything you could end up doing more harm then good.
I think unless you get worried its best not to say.
If however you did get worried perhaps talking about your own self harm may be a way to broach it? x

[Pi.R^2]

If I wanted to mention it, I would probably do so via email or facebook message or something, as face to face they might feel put on the spot, and if it's via message it's easier for them to not rely if they'd rather not. Personally, it would really depend on the person whether I asked at all, but I'd probably just send a little facebook messages saying that I'd noticed and wasn't sure if they were still struggling, but was here if they ever needed to talk, and super sorry if I've jumped to the wrong conclusion.

[Avalon]

Thanks for the feed back. I think I'm going to leave it for now as we haven't known each other that long. As ajrocks brought up, there could be another reason for the scars and don't want to assume anything.
I have made a point to roll up the sleeves of my sweatshirt a couple of times while around him. Since I usually get questioned about my scars from 99% of people, him not saying anything is another indicator that his scars are from the same thing. SIers tend not to ask questions.
I appreciate the advice everyone. Thanks

[ajrocks]

no problem take care