What is self-injury?
Self-injury (or sometimes called "self-mutilation") is the act of attempting to alter a mood state through inflicting physical harm to one's self. In other words, it is when an individual hurts themselves to release some sort of distress (or negative stress). To deal with overwhelming stress, one may act through one or more of the self-injurious behavior including carving, scratching, branding, marking, burning, biting, bruising, hitting, and pulling the skin and the hair. The most common seen behavior are cutting, burning, and head-banging.

Depression is when you are feeling very low or down for a long period of time. There are different types of depression manic depression, bipolar affective disorder, seasonal affective disorder (SAD), or post-natal depression (PND).