[Nightblood.]

Everyone is different in the way they deal with self harm. Not everyone feels the need to be really secretive and this doesn't necessarily mean someone is looking for attention. Even if someone IS looking for attention, that's a sign that they do need help. It is still just as serious an issue as someone who covers up. While he may be getting attention at home or school, it may not be the attention he needs. He may not even know he wants/needs attention. I would still try to be supportive. Talk to him about it, if he wants to and you're comfortable enough to ask.