I learned that when we confess, we are opening up the wound so that He can heal us, truly heal us. No more 12 steps to 'self care', no more band-aid solutions that eventually lead to infection and spread into other areas of life. God wants the matter settled, once and for all so that we can move on to the next course in our spiritual growth.
So, it attacks itself. Since the disease is non specific on what it will attack, it has a very high range of things it will attack.