What can cause a full body rash to suddenly appear--face trunk legs arms--with no itching and no other apparent symptoms other than low grade fever for a few hours three days ago?

Answer 1

Fifth disease?? Google the symptoms for this disease as it sound very much like what you've described barring any unmentioned symptoms. Fifth disease begins with a low-grade fever, headache, and mild cold-like symptoms (a stuffy or runny nose). These symptoms pass, and the illness seems to be gone until a rash appears a few days later. The bright red rash typically begins on the face. Several days later, the rash spreads and red blotches (usually lighter in color) extend down to the trunk, arms, and legs. The rash usually spares the palms of the hands and soles of the feet. As the centers of the blotches begin to clear, the rash takes on a lacy net-like appearance. Kids younger than 10 years old are most likely to get the rash. Older kids and adults sometimes complain that the rash itches, but most children with a rash caused by fifth disease do not look sick and no longer have fever. It may take 1 to 3 weeks for the rash to completely clear, and during that time it may seem to worsen until it finally fades away entirely. http://kidshealth.org/parent/infections/skin/fifth.html#