Mosquito bites the whole arm is swollen to consider is on the one hand may be the mosquito bites after the allergic reaction, on the other hand, need to pay attention to whether the combined infection, redness and swelling, need to actively use medication to avoid aggravation of the symptoms. 1. Allergic reaction: generally after this symptom can be used under the guidance of the doctor antihistamines, such as loratadine, cetirizine, stavudine hydrochloride tablets, etc., but also can be used topically hormonal ointment, such as dinexed cream, mometasone furoate cream. Can 2. Secondary infection: mosquito bites after cream scratching serious, resulting in epidermal breakage, may be secondary to bacterial infection, manifested as redness, swelling and heat pain in the surrounding skin, this time according to the condition of the need to use mupirocin ointment or erythromycin ointment and other medication, oral antibiotic treatment if necessary. Usually need to do a good job of personal protection, you can use mosquito repellent water or mosquito repellent tablets, go out and wear long sleeves and long pants, it is best not to go to the mosquito more often; mosquito bites in time to control the symptoms of the drug, to avoid excessive scratching, so as not to appear infected.