Mosquito bites appear itchy skin, the reason is mainly after the mosquito bites the skin, mosquito saliva injected into the bite site, mosquito saliva contains a large number of proteins and other allergens, resulting in an allergic reaction at the bite site. Allergic reaction can trigger an inflammatory reaction, red and swollen areas, redness, swelling and pain later, inflammation leads to the release of large amounts of histamine at the bite site, which can affect many cellular responses, especially allergic reactions and inflammatory reactions. The allergic reaction and inflammatory reaction can lead to increased itching. Therefore, you always want to scratch with your hands, and after scratching, it leads to the release of large amounts of histamine locally, which in turn leads to the aggravation of allergic and inflammatory reactions, forming a vicious circle. Therefore, after being bitten by mosquitoes, it is recommended to give ointment, safflower powder or anemone to apply, and avoid scratching with force, so as not to aggravate the inflammatory reaction and allergic reaction, and secondary infections that cause adverse consequences.