I Am 75 Years Old And An Irritating Rash Has

I am 75 years old and an irritating rash has developed on my lower stomach area, a small patch which began 4 days ago. It is somewhat itchy but mostly it burns and sometimes feels like pis are sticking in me. I think I had chicken pox but really do not remember. It is not painful enough to bother my busy Dr but I am concerned. It is very uncomfortable to wear anything around my waist. Thank you. Martha rENO