I have a small skin colored bump near the back of my vagina on the lip. It is almost flat but it is hard. It itches once in a while. What is it?

Hard to tell. Most skin issues really need to be seen to be diagnosed well. There are a lot of other questions to be asked as well. There are several things this could be - including sebaceous gland, dermatofibroma, lichen planus, wart, sexually transmitted disease, etc. Don't be too worried about it, but have someone look at it.