By the mosquito bite red spots, a long time does not dissipate, is generally allergic body. This allergic body is mainly because the body’s immune function disorder and the body is over-sensitive, after being bitten by mosquitoes, mosquitoes in vivo venom in the body after the role of a hypersensitive reaction. Local skin surface will form erythema, papules, some people will show blisters, blisters and many other clinical symptoms. After the lesions subside, red, persistent erythema will remain, which usually fades within 2-3 months and may leave a gray or black pigmentation on the skin surface. This body type of people, it is recommended in the early insect bites, under the guidance of a doctor to choose desensitizing topical creams to treat, can to a certain extent to avoid the red spots remain too long.