A one-and-a-half-year-old child has a fever rash.

If the child has a fever, the rash is considered to be a child's acute rash. If it appears on the first day after the fever, it may be caused by infection with chickenpox virus. If the child has an acute rash, care and symptomatic treatment can be strengthened for the child. If chickenpox, antiviral drugs can be used.