Talk to Dermatologist on Shringles Or Heat Rash (No Diagnose Yet)

I first had the rash on my back thought it was an heat rash but then it started going from the front to the back i have been in discomfort when ever the clothes touch it. And now from the past two days i have been having burning sensation on some parts of the skin first it was on my forearm and now its on my leg above the foot as well Now i also have some sort of pain in my head when ever i touch my head or it touches something