Mosquito saliva contains formic acid, after being bitten, the body will release a compound called “histamine” to fight foreign substances, and this immune response triggered an allergic reaction to the bite site, it will produce itching, swelling feeling. For allergic reactions are not serious, you can apply some simple daily methods to help reduce swelling and itching, common quick swelling and itching tips include the following: 1, cold compresses: cold compresses can make local capillary constriction, to quickly reduce the role of swelling and itching. Available towel wrapped in ice, or the use of ice bags on the local cold compress for about 15 minutes, and then interval, and then continue to cold compress, avoid direct contact with ice mosquito bites, so as not to frostbite skin; 2, coated with soap and water: mosquito bites can be properly coated with local soap and water to stop itching. Soapy water for alkaline, can be neutralized with formic acid reaction, into nearly neutral salts, to achieve rapid swelling and itching; 3, drug treatment: can also be used externally with flower lotion, cool oil and other drugs containing mint ingredients, or topical stove glycolic lotion, Dinaide cream, etc. to reduce swelling and itching. In addition, if the mosquito bite after the appearance of more obvious blisters, or the degree of swelling is too serious, it is recommended to go to the hospital. According to the specific situation, the herpes fluid aspiration, and under the guidance of a professional doctor to take antibiotic drugs to prevent infection.