What is the reason for many small red spots appearing on the front and back after a fever?

Patient's question:

Basic Information: Female, 8 months old, Disease/Symptoms, Small red spots on the chest and back
Condition Description: My baby was feverish a few days ago, but she is not burning 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 acute childhood rash. After 3-4 days of continuous fever, the temperature will drop, and some rashes will appear on the body. The rashes are light red and needle-sized. They first appear on the trunk and then spread to the entire body, with the trunk being the most affected area. They are also visible on the face and neck. It can be resolved within 1-2 days. After the rash subsides, there will be no scars on the skin. Parents don't need to worry. The rash is accompanied by swollen lymph nodes in the neck, behind the ears, and behind the pillow, but there is no tenderness. They will gradually subside after a few weeks of fever reduction.