Bitten by mosquitoes can usually cause papular urticaria, you can use general treatment, local topical drugs, take antihistamines and other methods to reduce swelling and itching. 1. General treatment: mosquitoes will inject some acidic ingredients in their saliva into human skin when biting people, and this acidic material will cause allergic reaction in human body, resulting in redness, swelling and itching of the bitten parts. Patients should avoid scratching, reduce irritation, avoid local infection, etc., at the same time should do a good job of anti-mosquito, mosquito repellent work, to avoid biting again. 2. Local topical drugs: patients can use glycerin lotion under the guidance of the doctor to astringent and itching, but also can be used externally to stop the effect of itching, such as compound camphor cream. 3. Take antihistamines: after being bitten by mosquitoes, the acidic substances contained in mosquito saliva are recognized by the body’s immune system will produce histamine and other substances, which will make the local skin manifested as redness, swelling, itching and so on. Patients can take loratadine, cetirizine hydrochloride and other drugs under the guidance of the doctor; when the symptoms are more serious, can also be systematically applied glucocorticoid drug treatment. After being bitten by mosquitoes, you need to wash the affected area first, and then use medication under the guidance of a doctor to reduce swelling and relieve itching. Do not take the drugs privately, so as not to cause serious adverse reactions.