The baby after the vaccine rash all over the body may be an adverse reaction to the vaccine, or scarlet fever, eczema and other diseases caused by the need to take the baby to the hospital in a timely manner, for specific reasons to take general measures, drug treatment. 1. Adverse reaction to vaccines: some babies will have a red rash all over the body after vaccination, need to take the baby to the doctor in time, under the guidance of the doctor to strengthen the baby’s skin care, mild cases can be used in accordance with the doctor’s instructions, such as cetirizine, chloroform and other antihistamines, some of the children can be self-cured. Severe children need to follow the doctor’s instructions to use budesonide, dexamethasone and other glucocorticosteroids. 2. Scarlet fever: common symptoms include red rash and fever. Children need to rest in bed, pay attention to the isolation of the respiratory tract and hand hygiene. Children need to use penicillin as prescribed by the doctor. If allergic to penicillin, antibiotic drugs such as azithromycin and clindamycin can be used as prescribed by the doctor. 3. Eczema: Typical symptoms include erythema, papules, blisters and itching. The child’s bed needs to be loose, cotton based, avoid excessive cleaning of the skin, reasonable use of emollients. Children need to follow the doctor’s instructions to use topical glucocorticosteroids such as dexamethasone acetate ointment and dieldrin ointment, as well as immunosuppressants such as tacrolimus and pimecrolimus. If the baby after vaccination whole body red rash is a more serious situation, you need to go to the hospital in time to consult the doctor.