The redness and swelling of mosquito bites can be divided into three steps to deal with cleaning, applying medicine and seeking medical attention. 1. Clean: all kinds of mosquito bites do not appear after the wound, you can local topical eau de toilette to stop itching; if there is a wound, you can first choose to use soap and water, soda and other alkaline substances to smear or rinse. 2. Apply medicine: the first thing you can do is to apply cold compresses, you can use a cool towel to apply cold compresses to the red and swollen parts, or you can use 3% boric acid solution to apply wet compresses, and apply glycerine lotion to stop the itching; or you can use local topical glucocorticosteroid creams such as Dinocap ointment and dexamethasone ointment to reduce inflammation and stop the itching. 3. Seek medical advice: If the symptoms are more serious or the inflammation range is relatively large, after the above two steps of treatment is still not recovered, you need to go to the hospital, under the guidance of the doctor oral medication, commonly used antihistamines, such as cetirizine, orotidine hydrochloride tablets, etc.; can also be short-term oral glucocorticosteroids such as prednisone. If you are seriously ill after being bitten by mosquitoes, please go to the hospital in time to avoid delaying your condition. The drugs mentioned above should be used in accordance with medical advice.