Otherwise known as Self Mutilation Disorder, Cutting Yourself Disorder is related to stress and depression and affects 2 million Americans today. The temporary physical pain is like a defense mechanism which gives them temporary relief from their emotional pain.
Initially I thought I might make a post saying this might be Photoshopped (since we keep talking about that Selena and Justin picture) but just in case this picture is real then it needs to be taken seriously so I'll just say this.... If you are suffering from this you need to recognize that it is not normal and go get the help you need.
Learn more about Cutting Yourself Disorder.