I have a small rash, little red dots below my neck on right side, more on top of back left of my right shoulder, I had it for a week now, some numbing and mild itching, some muscle pain and heat on and off, went to doctor and he did not know what it is, he said maybe shingles, he prescribed ointment with cortisone and it has been better for four days, it also is tender if I touch the rash, I do not have blisters. I would like to know, how long it takes to spread since it hasn t and I would like to rule out shingles