I don't know why I do this or what it means, but quite often, I pinch bits of skin from my lower lip so that it will bleed. This isn't an absent-minded habit like nail-biting, because the object is definitely blood. I want myself to bleed, and sometimes, I run my lips over paper until the whole page is full of blood. If I don't have paper, I'll use the back of my hand. In some cases, it's just something I do when I'm bored or when my hands have nothing to do, but I've noticed I do it a lot when I'm upset, nervous, or lonely. I've tried to stop several times, but it's an addiction, and quite honestly, it doesn't seem all that harmful. I've never felt the desire to cut myself anywhere else and I'm not suicidal. But seeing the blood and feeling the little tingle of pain gives me an acute sense of pleasure that I can't quite understand. I've heard this symptom is sometimes a part of OCD, but I don't display any other symptoms of OCD. So is this behavior part of a larger problem, or is it just something I should write off and ignore?