text: help me with a rash question? my son has a rash that is raised filling to the touch. it kinda fills like sandpaper. it is all over his checks, trunk, fore arms, and legs. he has a slight fever and was sick with vomiting 2 nights ago. he acts fine now except complains of a headache. want to you think it might be? he is 9 years old and current on all of his shots. have you ever heard of fifths disease?  it's a little like measles.. very common but.. can be contageous. you can take him to the doctor if that is what it is and there's not much they can give you for it. treat it like you would poison ivy and give him baths in that oatmeal powder stuff.. it will soothe the itching. but.. for sure i'd get a positive id on this from a physician.