I do that too! Never thought of it as SI, but I like picking the scabs off. Interesting question. Maybe it depends on why you do it, and what your intent is. If you are using it as a coping mechanism maybe it has an SI component, but if it is just a nervous habit, then probably not. What does it mean to you?

<font color=orange>"Success is the ability to go from failure to failure without losing your enthusiasm. - Winston Churchill "</font color=orange>