There are several reasons why one side of the vulva is itchy: 1, there may be gynecological inflammation that is vulvovaginitis, because the female vagina, anus and urethra are adjacent to each other. So it is easy to be infected by bacteria, and the three are connected with the outside world, when one side of the vulva inflammation can cause vulvar itch. If only one side of the vulva has inflammation will make one side of the vulva itch, while the other side of the vulva does not itch; 2, to pay attention to the vulva whether there is a foreign body growth, because vulvar tumors, vulvar cystic disease is also very common. When there is a foreign body growing on the vulva, the secretion and the necrotic shedding material of these foreign bodies can stimulate the skin and mucous membrane at the vulva, so that the sensory nerves are stimulated to produce vulvar itchy feeling. If the situation is more serious, it may also produce a strange itch that is unbearable.