After being bitten by mosquitoes, large blisters appeared, at this time you can apply syringe to extract blisters for treatment, and before and after the extraction of blisters need to apply povidone-iodine, in order to achieve disinfection, anti-inflammatory effect of treatment. At the same time, if the blister breaks down and there is an erosive surface, you can apply wet Levonorgestrel solution 2 times/day, 20 minutes/times to prevent infection, and then apply polymyxin B ointment or mupirocin ointment to strengthen anti-infective treatment, and you need to take levocetirizine hydrochloride capsule 1 time/day, 1 capsule/times. If the blisters are more, you can also with compound glycyrrhizin capsule 3 times / day, 2 capsules / times for treatment, if the vesicle surface is relatively large, you can apply comfrey oil, licorice oil and then wet compress treatment, can make the vesicle surface quickly dry, crust.