I Am A 34 Year Old Female. I Had Chicken

I am a 34 year old female. I had chicken pox as a child. I have no known allergies. The upper part of my chest and back is extremely itchy. It almost looks likes rash with small red dots popping up after itching. My skin on my collarbone, especially in the center, and my shoulders feels dry and almost scaley. This has been going on for about 2 weeks. I haven't tried any new food that I can recall and I haven't changed laundry detergent, soap, etc. What is going on?! Please help.