As long as the rash is dense on the front and back of the body, most of the rash is out. The rash tends to come out very quickly, with fever appearing at the beginning and the rash starting to appear after the fever has lasted for about 3-4 days. The rash is mostly on the head and face at first, then it will soon spread all over the body, especially on the front chest and back and other trunk areas, and lasts for about 1-3 days, so if there is a rash on the front chest and back, it means that the rash is basically complete.