Self-injury - Scab-picking

I've been researching a little on self-injury, because I pick at scabs to make them bleed. The main site I've found is for the American Self-Harm Information Clearinghouse. I currently have a big scab on my face to the lower right of my mouth. It's really itchy, and it hurts. Since this morning, I've been able to keep from picking at it.

Sometimes, like when I'm in the shower, I've used the razor to cut it. Typically, it starts out as something small and eventually becomes big. I've used hydrogen peroxide to help clean it, and some anti-bacterial ointment to help keep it moist. When the scab on my face gets dry, it becomes really itchy and painful, like it is now.