What disease is it when a baby gets many small red spots after a fever?

Patient's question:

Basic Information: Female, 8 months
Disease/Symptoms: Small red spots on the chest and back
Description of Condition: My baby is eight and a half months old. A few days ago, she had a high fever, but she doesn't have a fever tonight. However, many small red spots have appeared on her chest and back. What could be the reason?

Doctor's answer:

Hello! It might be roseola. The child has a continuous fever for 3-4 days, then the temperature drops, and some rashes will appear on the body. The rashes are pale red and needle-sized, first appearing on the trunk, then spreading to the whole body. The trunk has the most rashes, and they can also be seen on the face and neck. They can disappear within 1-2 days, leaving no scars on the skin. Parents don't need to worry. At the same time as the rashes appear, there may be swollen lymph nodes in the neck, behind the ears, and at the back of the head. However, there is no tenderness. After the fever subsides, the swollen lymph nodes gradually disappear over several weeks.

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