Scattered rashes after the MMR vaccine (short: MMR vaccine) usually do not require special treatment, such as the appearance of a large number of rashes can be treated with anti-allergy therapy. The active ingredient of MMR vaccine is live attenuated measles, rubella and mumps viruses, and the vaccine is intended for susceptible persons over 8 months of age to prevent measles, rubella and mumps. If a large number of urticaria-like rashes appear within 72h after vaccination with the combined live attenuated MMR vaccine, it is mostly considered to be caused by allergy to drugs, and anti-allergy treatment can be given, such as cetirizine hydrochloride, dicloretidine and other antihistamine drugs. If the scattered rash appeared after the vaccination, mostly in 6 to 12 days after the vaccination, usually do not need special treatment, usually about 2 days can subside by themselves. Baby rash, need to have a specialist to clarify the cause of the disease and guide the treatment, do not blindly self-medication, so as not to cause adverse effects on the body.