The main point of differentiation between rubella and measles 1. is the rash, but both rashes are maculopapular, this point is sometimes difficult to distinguish, the only difference is that the skin color between the two rashes of measles is normal, the skin color between the two rashes of rubella can be normal or red, so the rash characteristics of rubella is between measles and scarlet fever. 2. in addition, their prodromal period is different, the prodromal period will have fever The rash can be spread all over the body in one day. Measles has a prodromal period of about three or four days, and it takes about three days for the rash to spread throughout the body. The rubella rash lasts for about three days, so it is also known as three-day measles.3. The measles rash takes about a week in total. The rash is accompanied by a significant fever when it appears, but not rubella.