I have no rash or allergy as I have switched soaps, and detergents to test that possibility. During the course of the day I will scratch at my back till I bleed. Other particular areas but not limited to are, my forearms near the bend and the same for the thighs to both sides of the knees. When I scratch it just gets worse, almost like ants biting me. My chest and stomach are also popular as well as my scalp at times. When I scratch one area almost always another area starts too. WHAT'S THE DEAL?