The inner labia can vary in color from pink to brownish black depending on the color of a woman's skin.
Opening of the vagina also can vary in color from pink to brownish black depending to the skin color of women. If it is pink , it can turn to red with irritation or any color combination between red and brownish black depending to the color of the women's skin.
Inner labias are located at the entrance of the vagina, their color also reflect the color of the vagina. The color of the vagina of a white woman can be either white or pink. The vagina sometimes also can be covered with a tiny layer of a yeast which can be normal . If there is a discharge like cottage cheese and with mild smell that suggest an infection . Women at the same time complains of itching and burning during urination with the yeast infection. So , at the present time you are not symptomatic other than white color at the beginning of the vagina. It is hard to tell what it is because of the limitations of the Internet. I suggest to you to see a Gynecologist for an evaluation. Does not look like an STD and also does not look like a yeast infection.