There are many reasons for adults to have red spots on their bodies after a fever, most often due to a rash disease, and there are many types of rash diseases, such as measles caused by measles virus infection, followed by chicken pox, and then rickettsial virus infection, or typhoid infection, all of which can easily lead to red spots after a fever. The phenomenon of red spots on the body. The first thing you need to do is to go to the hospital for specific tests, such as blood tests, C-reactive protein and antibodies to Mycoplasma pneumoniae, to clarify the type of infection, most rashes are viral infections, C-reactive protein is elevated, accompanied by a mild increase in eosinophils or normal. In this case, antiviral medications can be used to treat the disease, such as Four Seasons Antiviral Combination and Ribavirin Granules, which are more effective. During the fever, if the temperature is higher than 38.5 degrees, indomethacin suppositories should be inserted into the anus to reduce the fever.