The hazards of private injection of shrinking needle usually mainly include bacterial infection, dysfunction of flora, mucous membrane damage, etc., once found need to seek medical treatment in time. Because the injection shrinkage needle may cause bacterial infection in the pubic area, thus causing gynecological diseases; and shrinkage needle contains a certain amount of hormones, injected into the vagina will lead to dysfunction of the vaginal flora, which will aggravate the gynecological diseases in the vagina; and the injection may make the local mucous membrane of the vagina erosion or descaling and other adverse reactions. Although the shrinking needle can temporarily relieve the phenomenon of vaginal laxity after using the drug, but it is still difficult to achieve the effect of long-term shrinking of the vagina, and the side effects are larger, the use of drugs need to be carried out under the guidance of a professional doctor, and should not be unauthorized use of drugs.