Itching

Im not sure if its a rash or what. I have never been allergic to anything in my life. For the past few months my legs have been itching horribly. Its all over my legs. At first my skin did not appear to be dry or anything. It was just itching with no signs at all. Now im starting to see these little red dots kinda in a circle and my skin is drying out where it itches. I have an appointment with my dermatologist next month. But I am really worried about what is causing this. I dont know if its a form of disease or what. It itches all day long nothing triggers it. I just sit here at work and itch all day, sometimes i will scratch until my legs bleed. Please help me figure out what this is.