The common causes of redness and swelling of baby’s skin are: insect bite dermatitis, urticaria, acute cellulitis and so on. 1. Insect bite dermatitis: a toxic reaction caused by some mosquito bites. The baby was mosquito bites, can cause local skin redness and swelling, and accompanied by obvious itching. You can follow the doctor’s instructions to apply local glycerine lotion to stop the itching. 2. Urticaria: If the baby is exposed to allergic substances, it is easy to cause urticaria within a short period of time, resulting in the baby’s local or generalized red skin, resulting in redness and swelling of the baby’s skin. The skin lesions will also have itching symptoms. It is recommended to look for and avoid allergens. 3. Acute cellulitis: usually due to Staphylococcus aureus, hemolytic streptococcus infection. It is often characterized by redness, swelling and pain in the local skin, and the lesion can be further expanded to the surrounding area, and there is no obvious boundary between the inflammation and the normal skin tissue. If an abscess has been formed, it is recommended to cut and drain in time. In short, there are many reasons for the baby’s skin redness and swelling, when the baby’s skin is red and swollen, it is recommended to go to the regular hospital in time, and follow the doctor’s instructions for treatment.