Bags after being bitten by mosquitoes, considering the mosquito secretion toxin stimulation, allergy, local infection and other phenomena caused. 1. Toxin stimulation: mosquitoes in the bite of the human body, can release an organic acid, and this organic acid into the body, can lead to skin inflammation, so will cause local skin itching, pimples and blisters and other phenomena. 2. Allergy: some patients may have an allergic reaction to this organic acid, thus causing the appearance of papular urticaria, which can appear in the body of pea-sized erythema, and accompanied by itching phenomenon, which can seriously affect the patient’s daily life and work. 3. Local infection: some patients in the mosquito bites, because of the itching and excessive scratching, can also lead to local skin secondary infection, serious can also lead to dengue and cellulitis and other phenomena. After being bitten by mosquitoes, we should pay attention to avoid excessive scratching of local tissues, it is best to follow the doctor’s advice to use glycerine lotion and so on to apply, can play a relief of itching and other uncomfortable symptoms. If the symptoms are serious, it is recommended to go to the hospital in time, and choose the appropriate treatment under the guidance of the doctor.