Bitten by mosquitoes red and swollen, if the symptoms are mild can not be treated, for the more obvious symptoms can be treated with local medication, oral medication. 1. No treatment: mosquito bites red and swollen is a common symptom of inflammatory reaction, there will generally be varying degrees of itching, most of them will be relieved on their own, do not need special treatment. Pay attention to personal hygiene, avoid scratching can be. 2. Local medication: If the itching is very obvious, you can use glycerin lotion to protect the skin and relieve itching. Or apply glucocorticoid ointment to strengthen the anti-inflammatory effect, such as dechlorodexamethasone, hydrocortisone butyrate and so on. 3. Oral medication: for more serious symptoms can be combined with oral medication, such as cetirizine, loratadine and so on. Mosquito bites red swelling if the symptoms do not improve, or accompanied by other symptoms, such as dizziness, should be as soon as possible to seek medical attention, the above drugs should be used in strict compliance with medical advice.