The baby was mosquito bites red, swollen and hard blisters and allergy-related, can be applied externally, wet compresses, oral anti-allergy drugs, if necessary, anti-infection treatment. The baby was bitten by mosquitoes appear red, swollen and hard with blisters, is generally an allergic reaction, if the blisters are relatively small, parents can give the baby local application of iodine povidone for disinfection, the use of glycerine lotion to stop the itching, and at the same time external glucocorticosteroid medication to help reduce swelling and itching, such as Dinocaprolactone cream and so on. If the blisters are more serious, you can give your baby anti-allergy drugs, such as loratadine, under doctor’s supervision. If the blister breaks, you need to pay attention to the prevention of infection, you can use topical anti-infective drugs, such as fusidic acid cream. If the baby was mosquito bites red, swollen and hard blisters, the symptoms are more serious, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to choose the drug, do not blindly give the baby medication to avoid causing side effects.