Hi, I have a extremely itchy rash which statrted under my arpits about one week ago and spread to my underarms, lower back,top of bottom. The rash has now spread to my elbows and top of my thighs, there are lots of fine red spots which feel very rough and itchy. Some look like as if the have bruising under the skin. Other than having a chesty caugh I feel fine in myself. However really concerned about this rash that is spreading and getting extremely itchy. What could the symptoms be and what shoudl I do to treat it? Age 32, 5ft 3, 9.stone