The Centers for Disease Control and Prevention describes the following progression of symptoms of measles with time after exposure to the virus.
The first symptoms of measles usually involve the following:
Next, about 2 to 3 days after the symptoms of measles begin, tiny white spots (also known as Koplik spots) can appear. The Koplik spots usually appear inside the mouth.
Next, a rash starts to break out about three to five days after symptoms of measles begin. The rash typically starts out as red spots on the face. The measles rash then spreads downwards to the rest of the body (neck to feet) from the face and hairline. As it spreads, the following characteristics can also be observed:
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During the appearance of the rash, a fever can go over 104° Fahrenheit.
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The small red spots start out flat but can develop raised bumps with time.
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The spots (with raised bumps) may join together as they spread downwards to the rest of the body (neck to feet).
The measles rash typically lasts about seven days. Similar to how it starts and spreads, the rash typically starts to fade first from the face and downwards to the rest of the body, fading last from the feet.