Viruses cause many illnesses in children, from colds and stomach infections to mumps. Sometimes children have general symptoms—such as not feeling like eating or just not feeling well—that do not fit with a specific illness.
If your child has a rash, contact your child's doctor. The doctor may be able to tell clearly if your child has an illness such as measles. Sometimes a child may have what is called a nonspecific viral illness that is not as easy to name. A number of viruses can cause this mild illness. Antibiotics do not work for a viral illness.
Your child will probably feel better in a few days. If not, contact the doctor.