Some causes of children having flushed cheeks are fifth disease, scarlet fever and atopic dermatitis, according to WebMD, Mayo Clinic and MedlinePlus, respectively. Fifth disease is a common disease among school children and is caused by a virus, according to WebMD.
The flushed cheeks in fifth disease are so prominent that it is also called "slapped cheek disease," says WebMD. It is usually mild and spread among children through sneezing and coughing. It is only dangerous to pregnant women and people who are anemic. The disease endangers the fetus as it can cause anemia and a higher risk of miscarriage.
Scarlet fever is a more serious disease that also causes a rash that shows up on the face and other areas of the body, states Mayo Clinic. The rash actually looks like a sunburn and is rough to the touch. If pressure is placed on the reddened area, it turns pale. There is also a pale ring around the patient's mouth. After the main symptoms of fever, strawberry tongue, chills, nausea and vomiting pass, the skin often peels.
A high fever can also cause flushed cheeks in a child, according to MedlinePlus. A child has a fever when a rectal thermometer reads 100.4 degrees Fahrenheit, when an oral thermometer reads 99.5 degrees, and when an axillary thermometer reads 99 degrees.