Is this depression?

My teenage son who has been very active and outgoing before suddenly became withdrawn with complaints of difficulty sleeping and feeling of crawling sensation all over the body. He does not take drugs or alcohol. My friends suggested that he could be depressed. I will appreciate your take on this.
Mrs KK (by SMS)

Your son certainly looks like he is depressed. In view of this, it will be good if he can seek a expert medical attention at the specialist or teaching hospital nearest to you.