Symptoms of Measles
The first symptoms of a measles infection are usually a hacking cough, runny nose, high fever, and red eyes. Kids also may have Koplik's spots (small red spots with blue-white centers) inside the mouth before the rash starts.

The rash breaks out 3–5 days after symptoms start, sometimes along with a high fever up to 104°F (40°C). The red or reddish-brown rash usually begins as flat red spots on the forehead. It spreads to the rest of the face, then down the neck and torso to the arms, legs, and feet. The fever and rash slowly go away after a few days.