Red spots on the face after fever are mainly caused by viral or bacterial infections. Due to viral infections, if children have rubella virus or measles virus, there will be red spots on the face after fever, rubella virus mainly appears 1-2 days after fever, children’s fever is very mild, there will be a slight cough, nasal congestion, runny nose and other symptoms. Measles occurs with red spots on the face 3-4 days after the onset of fever. If the child has scarlet fever, it will also cause red spots on the face after the fever, which is due to bacterial infection and can be treated with penicillin.