I've been getting raised bumps sporatically over different areas of my body. The bumps are itchy but only red if I scratch. What is the cause?

Hives/:Urticaria. This is due to histamine release from cells in the skin. They only do it when a signal goes to these cells from the lower brain that is a computer. By far the commonest cause is a "junk" diet, particularly sugary stuff. You will see this as my answer to many of the questions asked in this forum because dietary mayhem is the cause of so many problems in our culture.