The redness and swelling of the ear by mosquito bites is insect bite dermatitis, which can be regulated by general treatment, medication and other measures. 1. General treatment: first of all, you should keep the skin clean and hygienic, avoid extrusion, avoid scratching, you can use cold water to rinse or cold compresses, avoid using hot water scalding. 2 medication: you can use topical glycerine lotion and so on, at the same time under the guidance of the doctor to use hydrocortisone cream and other drugs for treatment. Patients with severe itching can take antihistamines such as loratadine and cetirizine for treatment. If there is skin breakage and secondary infection, antibiotic drugs such as erythromycin ointment and mupirocin ointment can be used. It is recommended that patients whose ears are red and swollen by mosquito bites go to the hospital in time for examination and treatment with medication under the guidance of the doctor.