Rash after fever may be rubella, rubella, measles, chicken pox and other diseases. 1.Measles: Measles can be manifested as a rash after fever, usually after 3~5 days of high fever, the body temperature drops to normal, and the rash starts to appear at the same time or after the fever goes down, and the rash is scattered rosy-colored maculopapular rash. 2. Rubella: Rubella is often a rash that starts 1~2 days after the onset of fever, and the rash is mostly scattered small maculopapular rashes that first appear on the cheeks and then spread to the trunk and limbs. 2. Measles: Measles is 3~4 days after fever, the rash is mostly reddish maculopapular rash, the rash from the back of the ear, hairline, gradually spread to the forehead, trunk, limbs and other places. 4. Chickenpox: chickenpox is generally 24 hours after the fever began to rash, the rash was centripetal distribution, appear in batches, spots, papules, blisters, scabs can exist at the same time. In addition to the above diseases, other diseases can also cause children to appear after the fever rash symptoms, it is recommended to consult a doctor in time to find out the cause and ask the doctor to deal with it.