Both unilateral and bilateral contracts are enforceable in court. For example, a unilateral contract is enforceable when someone chooses to begin fulfilling the act demanded by the promisor. A bilateral contract is enforceable from the get-go; both parties are bound the promise.
Yes, scratching is a form of self harm. Try to tackle this problem while you can because it has the potential to get worse. I started out scratching and now I burn myself with a lighter and cut myself. It's a self-destructive way to deal with overwhelming mental/emotional pain.
Self-injury, also known as self-harm, self-mutilation, or self-abuse occurs when someone intentionally and repeatedly harms herself/himself in a way that is impulsive and not intended to be lethal. The most common methods are: Skin cutting (70-90%), Head banging or hitting (21%-44%), and. Burning (15%-35%).