Redness, swelling, itching and blistering after mosquito bites in children are more serious forms of insect bite dermatitis, which can be treated with skin care, oral and topical medications. 1. Skin care: check the skin of the bite with or without insect mouthparts, if any, remove. Wash the affected area with soapy water and then use an ice pack to apply cold compresses to the swollen area. If the blisters have a large tension, use a syringe to extract the blister fluid, but be careful not to peel off the blister wall. 2. Oral medication: Antihistamines can be taken for itching, with preference given to second-generation drugs such as loratadine and cetirizine. 3. Topical drugs: the redness and swelling of the lesions can be applied to medium-acting corticosteroid creams, such as mometasone furoate, fluticasone propionate, which can accelerate the decline of inflammation and alleviate the symptoms, but need to pay attention to the symptoms of the relief of the use of stop. It is recommended to go to the hospital under the guidance of the doctor for treatment.