Fever after scarlet fever has been cured may be caused by the virus not completely cleared or by other reasons, and the cause should be identified before treatment. Scarlet fever is an acute respiratory infectious disease caused by group A beta streptococcus infection, which often manifests as fever and pharyngitis with a generalized rash followed by flaking. Fever after the scarlet fever is cured may be caused by the virus is not completely cleared, or infected with other diseases. If the virus has not been completely cleared, it is necessary to carry out treatment again, including isolation, the use of penicillin, erythromycin, cotrimoxazole and other drugs for antiviral treatment, the drug should be used under the guidance of a doctor. If the infection is caused by other diseases, it is recommended to go to the hospital to identify the cause of the disease and then treat it. Drugs should be used under the guidance of a professional physician, and should not be used arbitrarily on their own.