Vaginal itching can be a symptom of any number of sexually transmitted diseases. If you experience any of the following symptoms, or if you have any other reason to believe that you have been exposed to a sexually transmitted disease, see a doctor right away. Keep in mind that it is possible to have an STD even if you do not have any symptoms.  Trichomoniasis usually causes redness, a strong vaginal odor, and a yellow-green vaginal discharge, Chlamydia usually has no symptoms, but it may cause abnormal bleeding, vaginal discharge, and abdominal pain. Gonorrhea usually causes a thick, cloudy or bloody vaginal discharge, abnormal vaginal bleeding, anal itching, and painful urination. Herpes usually causes red bumps, blisters, or sores around the genital area. HPV or genital warts usually causes small, flesh-colored warts to appear near the genitals, which may appear in groups. If you have an STD, you will need to see a doctor for medical treatment. Some STDs can lead to serious complications if left untreated, so it's very important to see a doctor right away and take your medications as directed.  Gonorrhea, chlamydia, syphilis, and trichomoniasis can all be treated with antibiotics. Depending on the infection, your doctor may prescribe oral antibiotics or may give you an injection. HPV cannot be cured, but your doctor may be able to offer you treatments that can reduce the occurrence of genital warts. Herpes can be suppressed with antiviral drugs, which may help reduce outbreaks, but there is no cure and no way to guarantee that an infected person will not transmit the disease to others. The best way to avoid coming in contact with sexually transmitted diseases is to practice safe sex.  You will be safest from STDs if you are not sexually active or if you have one exclusive sexual partner who does not have an STD. If you have multiple partners, protect yourself from infection by using condoms whenever you have sex.

TL;DR in Vietnamese:
Nhận biết dấu hiệu cảnh báo của bệnh lây truyền qua đường tình dục. Đến bác sĩ khám. Ngăn nhiễm trùng về sau.